diff --git a/extensions/cornerstone/src/services/SegmentationService/SegmentationService.ts b/extensions/cornerstone/src/services/SegmentationService/SegmentationService.ts
index b8699f1e213..50e2d2c3c16 100644
--- a/extensions/cornerstone/src/services/SegmentationService/SegmentationService.ts
+++ b/extensions/cornerstone/src/services/SegmentationService/SegmentationService.ts
@@ -130,7 +130,7 @@ class SegmentationService extends PubSubService {
       throw new Error('Segment index 0 is reserved for "no label"');
     }
 
-    const toolGroupId = config.toolGroupId ?? this._getFirstToolGroupId();
+    const toolGroupId = config.toolGroupId ?? this._getApplicableToolGroupId();
 
     const { segmentationRepresentationUID, segmentation } = this._getSegmentationInfo(
       segmentationId,
@@ -361,7 +361,7 @@ class SegmentationService extends PubSubService {
   }
 
   public setActiveSegmentationForToolGroup(segmentationId: string, toolGroupId?: string): void {
-    toolGroupId = toolGroupId ?? this._getFirstToolGroupId();
+    toolGroupId = toolGroupId ?? this._getApplicableToolGroupId();
 
     const suppressEvents = false;
     this._setActiveSegmentationForToolGroup(segmentationId, toolGroupId, suppressEvents);
@@ -912,7 +912,7 @@ class SegmentationService extends PubSubService {
     }
 
     const segmentation = this.getSegmentation(segmentationId);
-    toolGroupId = toolGroupId ?? this._getFirstToolGroupId();
+    toolGroupId = toolGroupId ?? this._getApplicableToolGroupId();
 
     const segmentationRepresentation = this._getSegmentationRepresentation(
       segmentationId,
@@ -1313,7 +1313,7 @@ class SegmentationService extends PubSubService {
       if (remainingHydratedSegmentations.length) {
         const { id } = remainingHydratedSegmentations[0];
 
-        this._setActiveSegmentationForToolGroup(id, this._getFirstToolGroupId(), false);
+        this._setActiveSegmentationForToolGroup(id, this._getApplicableToolGroupId(), false);
       }
     }
 
@@ -1325,7 +1325,7 @@ class SegmentationService extends PubSubService {
   }
 
   public getConfiguration = (toolGroupId?: string): SegmentationConfig => {
-    toolGroupId = toolGroupId ?? this._getFirstToolGroupId();
+    toolGroupId = toolGroupId ?? this._getApplicableToolGroupId();
 
     const brushSize = 1;
     // const brushSize = cstUtils.segmentation.getBrushSizeForToolGroup(
@@ -1620,7 +1620,7 @@ class SegmentationService extends PubSubService {
       throw new Error(`Segment ${segmentIndex} not yet added to segmentation: ${segmentationId}`);
     }
 
-    toolGroupId = toolGroupId ?? this._getFirstToolGroupId();
+    toolGroupId = toolGroupId ?? this._getApplicableToolGroupId();
 
     const segmentationRepresentation = this._getSegmentationRepresentation(
       segmentationId,
@@ -1714,7 +1714,7 @@ class SegmentationService extends PubSubService {
     toolGroupId?: string,
     suppressEvents = false
   ) {
-    toolGroupId = toolGroupId ?? this._getFirstToolGroupId();
+    toolGroupId = toolGroupId ?? this._getApplicableToolGroupId();
 
     const { segmentationRepresentationUID, segmentation } = this._getSegmentationInfo(
       segmentationId,
@@ -1773,7 +1773,7 @@ class SegmentationService extends PubSubService {
       throw new Error(`Segment ${segmentIndex} not yet added to segmentation: ${segmentationId}`);
     }
 
-    toolGroupId = toolGroupId ?? this._getFirstToolGroupId();
+    toolGroupId = toolGroupId ?? this._getApplicableToolGroupId();
 
     const segmentationRepresentation = this._getSegmentationRepresentation(
       segmentationId,
@@ -2090,11 +2090,21 @@ class SegmentationService extends PubSubService {
     }
   }
 
-  private _getFirstToolGroupId = () => {
-    const { toolGroupService } = this.servicesManager.services;
-    const toolGroupIds = toolGroupService.getToolGroupIds();
+  private _getApplicableToolGroupId = () => {
+    const { toolGroupService, viewportGridService, cornerstoneViewportService } =
+      this.servicesManager.services;
+
+    const viewportInfo = cornerstoneViewportService.getViewportInfo(
+      viewportGridService.getActiveViewportId()
+    );
+
+    if (!viewportInfo) {
+      const toolGroupIds = toolGroupService.getToolGroupIds();
+
+      return toolGroupIds[0];
+    }
 
-    return toolGroupIds[0];
+    return viewportInfo.getToolGroupId();
   };
 
   private getNextColorLUTIndex = (): number => {
diff --git a/modes/tmtv/src/toolbarButtons.js b/modes/tmtv/src/toolbarButtons.js
index 6e336d4f83c..556e2172845 100644
--- a/modes/tmtv/src/toolbarButtons.js
+++ b/modes/tmtv/src/toolbarButtons.js
@@ -165,20 +165,6 @@ const toolbarButtons = [
           ],
           'Ellipse Tool'
         ),
-        _createToolButton(
-          'CircleROI',
-          'tool-circle',
-          'Circle',
-          [
-            ..._createCommands('setToolActive', 'CircleROI', [
-              toolGroupIds.CT,
-              toolGroupIds.PT,
-              toolGroupIds.Fusion,
-              // toolGroupIds.MPR,
-            ]),
-          ],
-          'Circle Tool'
-        ),
       ],
     },
   },
diff --git a/platform/core/src/services/DicomMetadataStore/createStudyMetadata.js b/platform/core/src/services/DicomMetadataStore/createStudyMetadata.js
index ee7415b9ac5..eaaab192a5b 100644
--- a/platform/core/src/services/DicomMetadataStore/createStudyMetadata.js
+++ b/platform/core/src/services/DicomMetadataStore/createStudyMetadata.js
@@ -26,7 +26,7 @@ function createStudyMetadata(StudyInstanceUID) {
       let series = this.series.find(s => s.SeriesInstanceUID === SeriesInstanceUID);
 
       if (!series) {
-        const series = createSeriesMetadata(SeriesInstanceUID);
+        series = createSeriesMetadata(SeriesInstanceUID);
         this.series.push(series);
       }
 
diff --git a/platform/docs/docs/configuration/dataSources/configuration-ui.md b/platform/docs/docs/configuration/dataSources/configuration-ui.md
index 15f3b0bcbad..b4279a26a2b 100644
--- a/platform/docs/docs/configuration/dataSources/configuration-ui.md
+++ b/platform/docs/docs/configuration/dataSources/configuration-ui.md
@@ -18,6 +18,11 @@ Google Cloud Healthcare data source.
 
 ![Data source configuration UI](../../assets/img/data-source-configuration-ui.png)
 
+:::tip
+A datasource root URI can be [fully or partially specified](../../deployment/google-cloud-healthcare.md#configuring-google-cloud-healthcare-as-a-datasource-in-ohif)
+in the OHIF configuration file.
+:::
+
 ## `BaseDataSourceConfigurationAPIItem` interface
 
 Each (path) item of a data source is represented by an instance of this interface.
diff --git a/platform/docs/docs/deployment/google-cloud-healthcare.md b/platform/docs/docs/deployment/google-cloud-healthcare.md
index 80a654d2620..54df8bb029e 100644
--- a/platform/docs/docs/deployment/google-cloud-healthcare.md
+++ b/platform/docs/docs/deployment/google-cloud-healthcare.md
@@ -128,3 +128,12 @@ cd OHIFViewer
 yarn install
 APP_CONFIG=config/google.js yarn run dev
 ```
+
+## Configuring Google Cloud Healthcare as a datasource in OHIF
+
+A Google Cloud Healthcare DICOM store can be configured as a DICOMweb datasource
+in OHIF. A full or partial path is permitted in the configuration file. For
+partial paths, the [data source configuration UI](../configuration/dataSources/configuration-ui.md)
+will assist in filling in the missing pieces. For example, a configuration with
+empty `wadoUriRoot`, `qidoRoot` and `wadoRoot` will prompt for the entire path
+step-by-step starting with the project.