diff --git a/plugin-designs/plugin-studio/plugin-studio.vue b/plugin-designs/plugin-studio/plugin-studio.vue
index b7c5a793a..ac39ced3a 100644
--- a/plugin-designs/plugin-studio/plugin-studio.vue
+++ b/plugin-designs/plugin-studio/plugin-studio.vue
@@ -225,7 +225,7 @@ import StudioTree from './src/StudioTree.vue'
 import { LANGUAGES, loadLocale, saveLocale, getLanguage, normaliseLocale } from '@map/layouts/app-wrapper-material/languages.js'
 import { publishMapToken, clearMapToken } from '@map/composables/useSharedMapToken.js'
 import { loadScriptOnce, whenTagDefined } from '@map/utils/embedScript.js'
-import { readViewKeys, writeViewKeys, onAddressChange, urlOwnerOf, commitUrl, ownAddress } from '@map/composables/useViewAddress.js'
+import { readViewKeys, writeViewKeys, onAddressChange, urlOwnerOf, commitUrl, ownAddress, depthOf } from '@map/composables/useViewAddress.js'
 
 // The reader's own map token / token-service URL. localStorage only: never written into the build,
 // never sent anywhere but Mapbox (the token) or the URL the reader typed (the service).
@@ -909,6 +909,9 @@ export default defineComponent({
       if (tokenUrl) pc.tokenUrl = tokenUrl
       if (this.effectiveProvider) pc.provider = this.effectiveProvider
       if (this.base) pc.treeBase = this.base
+      // A shell in a pane (the Research Gallery, Posterverse) writes its own tab one level below Studio's: ?subtab=,
+      // at this depth. Nothing else reads it.
+      pc.addressDepth = urlOwnerOf(this.cfg) ? 1 : depthOf(this.cfg) + 1
       return pc
     },
     setLocale(code) {