diff --git a/src/App/hooks/useLayoutMeasurements.js b/src/App/hooks/useLayoutMeasurements.js
index eba5b0f0..1daab048 100755
--- a/src/App/hooks/useLayoutMeasurements.js
+++ b/src/App/hooks/useLayoutMeasurements.js
@@ -11,6 +11,15 @@ const ATTRIBUTIONS_STACKED_CLASS = 'im-o-app__attributions--stacked'
 const buttonHeight = (ref) => ref?.current?.offsetHeight ?? 0
 const buttonWidth = (ref) => ref?.current?.offsetWidth ?? 0
 
+// A top column whose children are all display:none (hiddenWhen buttons, or items hidden by a
+// plugin's exclusive-control CSS) isn't :empty, so it keeps its trailing padding-bottom — which
+// would push the side column below it down by a gap. Treat it as empty instead.
+const topColHeight = (col) => {
+  const children = Array.from(col.children)
+  const isAllHidden = children.length > 0 && children.every(child => child.getClientRects().length === 0)
+  return isAllHidden ? 0 : col.offsetHeight
+}
+
 // Max of both sides, so centred content doesn't lean toward the emptier one.
 const symmetricWidth = (left, right) => left || right ? Math.max(left, right) : 0
 
@@ -191,7 +200,7 @@ export function calculateLayout (layoutRefs, breakpoint) {
   const { rise: attributionsLift } = applyAttributionsLayout({ appContainer, bottom, attributions, dividerGap, primaryGap })
 
   // === Left container offsets ===
-  const leftOffsetTop = sideOffsetTop(topLeftCol.offsetHeight)
+  const leftOffsetTop = sideOffsetTop(topColHeight(topLeftCol))
   const leftColumnHeight = bottom.offsetTop - leftOffsetTop - dividerGap
   appContainer.style.setProperty('--left-offset-top', `${leftOffsetTop}px`)
   appContainer.style.setProperty('--left-offset-bottom', `${main.offsetHeight - bottom.offsetTop + dividerGap}px`)
@@ -200,7 +209,7 @@ export function calculateLayout (layoutRefs, breakpoint) {
   // === Right container offsets === (mirrors the left formula)
   const bottomRightHeight = buttonHeight(bottomRightRef)
   const bottomContainerPad = main.offsetHeight - bottom.offsetTop - bottom.offsetHeight
-  const rightOffsetTop = sideOffsetTop(topRightCol.offsetHeight)
+  const rightOffsetTop = sideOffsetTop(topColHeight(topRightCol))
   const rightEffectiveBottom = bottom.offsetTop + bottom.offsetHeight - bottomRightHeight - attributionsLift
   const rightColumnHeight = rightEffectiveBottom - rightOffsetTop - dividerGap
   appContainer.style.setProperty('--right-offset-top', `${rightOffsetTop}px`)
diff --git a/src/App/hooks/useLayoutMeasurements.test.js b/src/App/hooks/useLayoutMeasurements.test.js
index 936e723b..d4d54ec0 100644
--- a/src/App/hooks/useLayoutMeasurements.test.js
+++ b/src/App/hooks/useLayoutMeasurements.test.js
@@ -77,6 +77,22 @@ describe('useLayoutMeasurements', () => {
     expect(layoutRefs.appContainerRef.current.style.setProperty).not.toHaveBeenCalled()
   })
 
+  test('treats a top column whose children are all hidden as empty, ignoring its trailing padding', () => {
+    const { layoutRefs } = setup({ refs: { topRightCol: { offsetHeight: 10 }, top: { offsetTop: 15 } } })
+    // jsdom gives every element empty client rects, i.e. the same as display:none
+    appendChild(layoutRefs.topRightColRef.current)
+    renderHook(() => useLayoutMeasurements())
+    expect(layoutRefs.appContainerRef.current.style.setProperty).toHaveBeenCalledWith('--right-offset-top', '15px')
+  })
+
+  test('measures a top column normally when any child is rendered', () => {
+    const { layoutRefs } = setup({ refs: { topRightCol: { offsetHeight: 50 }, top: { offsetTop: 15 } } })
+    appendChild(layoutRefs.topRightColRef.current)
+    appendChild(layoutRefs.topRightColRef.current, { getClientRects: () => [{}] })
+    renderHook(() => useLayoutMeasurements())
+    expect(layoutRefs.appContainerRef.current.style.setProperty).toHaveBeenCalledWith('--right-offset-top', '65px')
+  })
+
   test('calculates and sets all CSS custom properties', () => {
     const { layoutRefs } = setup()
     renderHook(() => useLayoutMeasurements())
diff --git a/src/config/appConfig.js b/src/config/appConfig.js
index b4278913..6d82d7fa 100755
--- a/src/config/appConfig.js
+++ b/src/config/appConfig.js
@@ -9,6 +9,11 @@ const keyboardBasePanelSlots = {
 }
 
 const buttonSlots = {
+  slot: 'top-right',
+  showLabel: false
+}
+
+const zoomButtonSlots = {
   slot: 'right-top',
   showLabel: false
 }
@@ -81,9 +86,9 @@ export const defaultAppConfig = {
     onClick: (_e, { mapProvider, appConfig }) => mapProvider.zoomIn(appConfig.zoomDelta),
     excludeWhen: ({ appState, appConfig }) => !appConfig.enableZoomControls || appConfig.enableMapControls || appState.interfaceType === 'touch',
     enableWhen: ({ mapState }) => !mapState.isAtMaxZoom,
-    mobile: buttonSlots,
-    tablet: buttonSlots,
-    desktop: buttonSlots
+    mobile: zoomButtonSlots,
+    tablet: zoomButtonSlots,
+    desktop: zoomButtonSlots
   }, {
     id: 'zoomOut',
     group: { label: 'Zoom controls', slotOrder: 0 },
@@ -93,9 +98,9 @@ export const defaultAppConfig = {
     onClick: (_e, { mapProvider, appConfig }) => mapProvider.zoomOut(appConfig.zoomDelta),
     excludeWhen: ({ appState, appConfig }) => !appConfig.enableZoomControls || appConfig.enableMapControls || appState.interfaceType === 'touch',
     enableWhen: ({ mapState }) => !mapState.isAtMinZoom,
-    mobile: buttonSlots,
-    tablet: buttonSlots,
-    desktop: buttonSlots
+    mobile: zoomButtonSlots,
+    tablet: zoomButtonSlots,
+    desktop: zoomButtonSlots
   }, {
     id: 'mapControls',
     label: 'Map controls',