diff --git a/src/ui/panelPositionControls.js b/src/ui/panelPositionControls.js
index ff296bf75..df4264a13 100644
--- a/src/ui/panelPositionControls.js
+++ b/src/ui/panelPositionControls.js
@@ -8,10 +8,14 @@ const PANEL_LAYOUT_STORAGE_VERSION = 'v6';
  * the layout-reset notice and the documented key.
  */
 const PANEL_POSITION_STORAGE_VERSION = 'v8';
-/** Floating panels' stored positions and hint flag: nothing reads them now. */
+/**
+ * Floating panels' stored positions and hint flag, and Street Level's saved
+ * FIT / FILL (each session now starts at FIT): nothing reads them now.
+ */
 const RETIRED_PANEL_KEY_PREFIXES = [
   `godsEyeView.${PANEL_POSITION_STORAGE_VERSION}.panelPos.`,
   `godsEyeView.${PANEL_POSITION_STORAGE_VERSION}.panelFloatHintShown`,
+  'gev:street-level:render-mode',
 ];
 export class PanelPositionControls {
   constructor({ syncPanelCollapseButton, showToast }) {
diff --git a/src/ui/panelPositionControls.test.mjs b/src/ui/panelPositionControls.test.mjs
index e6b2a6901..2cc05b7c0 100644
--- a/src/ui/panelPositionControls.test.mjs
+++ b/src/ui/panelPositionControls.test.mjs
@@ -14,11 +14,12 @@ function fakeStorage(entries) {
   return storage;
 }
 
-test('the floating panels’ stored positions and hint flag are dropped; collapse state stays', (t) => {
+test('retired panel and FIT / FILL keys are dropped; collapse state stays', (t) => {
   const saved = globalThis.localStorage;
   globalThis.localStorage = fakeStorage({
     'godsEyeView.v8.panelPos.cctv-panel': '{"x":1}',
     'godsEyeView.v8.panelFloatHintShown': '1',
+    'gev:street-level:render-mode': 'fill',
     'godsEyeView.v6.panelCollapsed.cctv-panel': '1',
     'godsEyeView.v8.layoutResetNotified': '1',
   });