diff --git a/src/components/SegmentGroupOpacity.vue b/src/components/SegmentGroupOpacity.vue
index f81e9b29..73b35868 100644
--- a/src/components/SegmentGroupOpacity.vue
+++ b/src/components/SegmentGroupOpacity.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { computed, toRefs } from 'vue';
 import { useGlobalLayerColorConfig } from '@/src/composables/useGlobalLayerColorConfig';
+import { useGlobalSegmentGroupConfig } from '@/src/store/view-configs/segmentGroups';
 
 const props = defineProps<{
   groupId: string;
@@ -21,12 +22,24 @@ const setOpacity = (opacity: number) => {
     },
   });
 };
+
+const { config, updateConfig: updateSegmentGroupConfig } =
+  useGlobalSegmentGroupConfig(groupId);
+
+const outlineOpacity = computed({
+  get: () => config.value!.config!.outlineOpacity,
+  set: (opacity: number) => {
+    updateSegmentGroupConfig({
+      outlineOpacity: opacity,
+    });
+  },
+});
 </script>
 
 <template>
   <v-slider
     class="mx-4"
-    label="Segment Group Opacity"
+    label="Segment Group Fill Opacity"
     min="0"
     max="1"
     step="0.01"
@@ -36,4 +49,15 @@ const setOpacity = (opacity: number) => {
     :model-value="blendConfig.opacity"
     @update:model-value="setOpacity($event)"
   />
+  <v-slider
+    class="mx-4"
+    label="Segment Group Outline Opacity"
+    min="0"
+    max="1"
+    step="0.01"
+    density="compact"
+    hide-details
+    thumb-label
+    v-model="outlineOpacity"
+  />
 </template>
diff --git a/src/components/vtk/VtkSegmentationSliceRepresentation.vue b/src/components/vtk/VtkSegmentationSliceRepresentation.vue
index 46f15cc5..89939d0e 100644
--- a/src/components/vtk/VtkSegmentationSliceRepresentation.vue
+++ b/src/components/vtk/VtkSegmentationSliceRepresentation.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { toRefs, watchEffect, inject, computed } from 'vue';
+import { toRefs, watchEffect, inject, computed, unref } from 'vue';
 import { useImage } from '@/src/composables/useCurrentImage';
 import { useSliceRepresentation } from '@/src/core/vtk/useSliceRepresentation';
 import { LPSAxis } from '@/src/types/lps';
@@ -17,6 +17,7 @@ import { vtkFieldRef } from '@/src/core/vtk/vtkFieldRef';
 import { syncRef } from '@vueuse/core';
 import { useSliceConfig } from '@/src/composables/useSliceConfig';
 import useLayerColoringStore from '@/src/store/view-configs/layers';
+import { useSegmentGroupConfigStore } from '@/src/store/view-configs/segmentGroups';
 import { useSegmentGroupConfigInitializer } from '@/src/composables/useSegmentGroupConfigInitializer';
 
 interface Props {
@@ -138,9 +139,14 @@ watchEffect(applySegmentColoring);
 sliceRep.property.setUseLabelOutline(true);
 sliceRep.property.setUseLookupTableScalarRange(true); // For the labelmap is rendered correctly
 
-// watchEffect(() => {
-//   sliceRep.property.setLabelOutlineOpacity(opacity.value);
-// });
+const configStore = useSegmentGroupConfigStore();
+const config = computed(() =>
+  configStore.getConfig(unref(viewId), unref(segmentationId))
+);
+
+watchEffect(() => {
+  sliceRep.property.setLabelOutlineOpacity(config.value?.outlineOpacity ?? 1);
+});
 
 const outlinePixelThickness = 2;
 watchEffect(() => {
@@ -149,11 +155,11 @@ watchEffect(() => {
   const { segments } = metadata.value;
   const max = Math.max(...segments.order);
 
-  const segThicknesses = Array.from({ length: max }, (_, i) => {
-    const value = i + 1;
-    const segment = segments.byValue[value];
+  const segThicknesses = Array.from({ length: max }, (_, value) => {
+    const segment = segments.byValue[value + 1];
     return ((!segment || segment.visible) && outlinePixelThickness) || 0;
   });
+  // console.log('segThicknesses', segThicknesses);
   sliceRep.property.setLabelOutlineThickness(segThicknesses);
 });
 
diff --git a/src/composables/useSegmentGroupConfigInitializer.ts b/src/composables/useSegmentGroupConfigInitializer.ts
index b2674f5a..7e514504 100644
--- a/src/composables/useSegmentGroupConfigInitializer.ts
+++ b/src/composables/useSegmentGroupConfigInitializer.ts
@@ -1,8 +1,9 @@
-import useLayerColoringStore from '@/src/store/view-configs/layers';
 import { watchImmediate } from '@vueuse/core';
 import { MaybeRef, computed, unref } from 'vue';
+import useLayerColoringStore from '@/src/store/view-configs/layers';
+import { useSegmentGroupConfigStore } from '@/src/store/view-configs/segmentGroups';
 
-export function useSegmentGroupConfigInitializer(
+function useLayerConfigInitializerForSegmentGroups(
   viewId: MaybeRef<string>,
   layerId: MaybeRef<string>
 ) {
@@ -16,6 +17,25 @@ export function useSegmentGroupConfigInitializer(
 
     const viewIdVal = unref(viewId);
     const layerIdVal = unref(layerId);
-    coloringStore.initConfig(viewIdVal, layerIdVal);
+    coloringStore.initConfig(viewIdVal, layerIdVal); // initConfig instead of resetColorPreset for layers
+  });
+}
+
+export function useSegmentGroupConfigInitializer(
+  viewId: MaybeRef<string>,
+  segmentGroupId: MaybeRef<string>
+) {
+  useLayerConfigInitializerForSegmentGroups(viewId, segmentGroupId);
+
+  const configStore = useSegmentGroupConfigStore();
+  const config = computed(() =>
+    configStore.getConfig(unref(viewId), unref(segmentGroupId))
+  );
+
+  watchImmediate(config, (config_) => {
+    if (config_) return;
+    const viewIdVal = unref(viewId);
+    const layerIdVal = unref(segmentGroupId);
+    configStore.initConfig(viewIdVal, layerIdVal);
   });
 }
diff --git a/src/io/state-file/schema.ts b/src/io/state-file/schema.ts
index e251f7ac..536fb279 100644
--- a/src/io/state-file/schema.ts
+++ b/src/io/state-file/schema.ts
@@ -21,6 +21,7 @@ import type {
   SliceConfig,
   WindowLevelConfig,
   LayersConfig,
+  SegmentGroupConfig,
   VolumeColorConfig,
 } from '../../store/view-configs/types';
 import type { LPSAxisDir, LPSAxis } from '../../types/lps';
@@ -215,10 +216,15 @@ const LayersConfig = z.object({
   blendConfig: BlendConfig,
 }) satisfies z.ZodType<LayersConfig>;
 
+const SegmentGroupConfig = z.object({
+  outlineOpacity: z.number(),
+}) satisfies z.ZodType<SegmentGroupConfig>;
+
 const ViewConfig = z.object({
   window: WindowLevelConfig.optional(),
   slice: SliceConfig.optional(),
   layers: LayersConfig.optional(),
+  segmentGroup: SegmentGroupConfig.optional(),
   camera: CameraConfig.optional(),
   volumeColorConfig: VolumeColorConfig.optional(),
 });
diff --git a/src/store/view-configs/common.ts b/src/store/view-configs/common.ts
index e02adadc..3142fbfb 100644
--- a/src/store/view-configs/common.ts
+++ b/src/store/view-configs/common.ts
@@ -3,6 +3,7 @@ import { StateFile, ViewConfig } from '../../io/state-file/schema';
 import {
   CameraConfig,
   LayersConfig,
+  SegmentGroupConfig,
   SliceConfig,
   VolumeColorConfig,
   WindowLevelConfig,
@@ -14,7 +15,8 @@ type SubViewConfig =
   | SliceConfig
   | VolumeColorConfig
   | WindowLevelConfig
-  | LayersConfig;
+  | LayersConfig
+  | SegmentGroupConfig;
 
 type ViewConfigGetter = (
   viewID: string,
diff --git a/src/store/view-configs/segmentGroups.ts b/src/store/view-configs/segmentGroups.ts
new file mode 100644
index 00000000..cc1f05cf
--- /dev/null
+++ b/src/store/view-configs/segmentGroups.ts
@@ -0,0 +1,129 @@
+import { reactive, computed, unref, MaybeRef } from 'vue';
+import { defineStore } from 'pinia';
+
+import {
+  DoubleKeyRecord,
+  deleteSecondKey,
+  getDoubleKeyRecord,
+  patchDoubleKeyRecord,
+} from '@/src/utils/doubleKeyRecord';
+import { Maybe } from '@/src/types';
+
+import { createViewConfigSerializer } from './common';
+import { ViewConfig } from '../../io/state-file/schema';
+import { SegmentGroupConfig } from './types';
+
+type Config = SegmentGroupConfig;
+const CONFIG_NAME = 'segmentGroup';
+
+export const defaultConfig = () => ({
+  outlineOpacity: 1.0,
+});
+
+export const useSegmentGroupConfigStore = defineStore(
+  `${CONFIG_NAME}Config`,
+  () => {
+    const configs = reactive<DoubleKeyRecord<Config>>({});
+
+    const getConfig = (viewID: Maybe<string>, dataID: Maybe<string>) =>
+      getDoubleKeyRecord(configs, viewID, dataID);
+
+    const updateConfig = (
+      viewID: string,
+      dataID: string,
+      patch: Partial<Config>
+    ) => {
+      const config = {
+        ...defaultConfig(),
+        ...getConfig(viewID, dataID),
+        ...patch,
+      };
+
+      patchDoubleKeyRecord(configs, viewID, dataID, config);
+    };
+
+    const initConfig = (viewID: string, dataID: string) =>
+      updateConfig(viewID, dataID, defaultConfig());
+
+    const removeView = (viewID: string) => {
+      delete configs[viewID];
+    };
+
+    const removeData = (dataID: string, viewID?: string) => {
+      if (viewID) {
+        delete configs[viewID]?.[dataID];
+      } else {
+        deleteSecondKey(configs, dataID);
+      }
+    };
+
+    const serialize = createViewConfigSerializer(configs, CONFIG_NAME);
+
+    const deserialize = (
+      viewID: string,
+      config: Record<string, ViewConfig>
+    ) => {
+      Object.entries(config).forEach(([dataID, viewConfig]) => {
+        if (viewConfig.segmentGroup) {
+          updateConfig(viewID, dataID, viewConfig.segmentGroup);
+        }
+      });
+    };
+
+    // For updating all configs together //
+
+    const aConfig = computed(() => {
+      const viewIDs = Object.keys(configs);
+      if (viewIDs.length === 0) return null;
+      const firstViewID = viewIDs[0];
+      const dataIDs = Object.keys(configs[firstViewID]);
+      if (dataIDs.length === 0) return null;
+      const firstDataID = dataIDs[0];
+      return configs[firstViewID][firstDataID];
+    });
+
+    const updateAllConfigs = (dataID: string, patch: Partial<Config>) => {
+      Object.keys(configs).forEach((viewID) => {
+        updateConfig(viewID, dataID, patch);
+      });
+    };
+
+    return {
+      configs,
+      getConfig,
+      initConfig,
+      updateConfig,
+      removeView,
+      removeData,
+      serialize,
+      deserialize,
+      aConfig,
+      updateAllConfigs,
+    };
+  }
+);
+
+export const useGlobalSegmentGroupConfig = (dataId: MaybeRef<string>) => {
+  const store = useSegmentGroupConfigStore();
+
+  const views = computed(() => Object.keys(store.configs));
+
+  const configs = computed(() =>
+    views.value.map((viewID) => ({
+      config: store.getConfig(viewID, unref(dataId)),
+      viewID,
+    }))
+  );
+
+  // get any one
+  const config = computed(() => configs.value.find(({ config: c }) => c));
+
+  // update all configs
+  const updateConfig = (patch: Partial<Config>) => {
+    configs.value.forEach(({ viewID }) =>
+      store.updateConfig(viewID, unref(dataId), patch)
+    );
+  };
+
+  return { config, updateConfig };
+};
diff --git a/src/store/view-configs/types.ts b/src/store/view-configs/types.ts
index 781d6450..a048c67c 100644
--- a/src/store/view-configs/types.ts
+++ b/src/store/view-configs/types.ts
@@ -57,3 +57,7 @@ export interface LayersConfig {
   opacityFunction: OpacityFunction;
   blendConfig: BlendConfig;
 }
+
+export interface SegmentGroupConfig {
+  outlineOpacity: number;
+}