diff --git a/src/extern/kwin.d.ts b/src/extern/kwin.d.ts
index 8638303..688b8c3 100644
--- a/src/extern/kwin.d.ts
+++ b/src/extern/kwin.d.ts
@@ -21,7 +21,7 @@ declare const Workspace: {
     readonly currentActivityChanged: QSignal<[]>;
     readonly virtualScreenSizeChanged: QSignal<[]>;
 
-    clientArea(option: ClientAreaOption, output: Output, desktopNumber: number);
+    clientArea(option: ClientAreaOption, output: Output, kwinDesktop: KwinDesktop);
 };
 
 const enum ClientAreaOption {
diff --git a/src/layout/Desktop.ts b/src/layout/Desktop.ts
index 66c4122..1f1113b 100644
--- a/src/layout/Desktop.ts
+++ b/src/layout/Desktop.ts
@@ -38,7 +38,7 @@ class Desktop {
     }
 
     private static getClientArea(kwinDesktop: KwinDesktop) {
-        return Workspace.clientArea(ClientAreaOption.PlacementArea, Workspace.activeScreen, 0); // TODO: pass desktop
+        return Workspace.clientArea(ClientAreaOption.PlacementArea, Workspace.activeScreen, kwinDesktop);
     }
 
     private static getTilingArea(clientArea: QmlRect, kwinDesktop: KwinDesktop, pinManager: PinManager, config: Desktop.Config) {
diff --git a/src/world/Clients.ts b/src/world/Clients.ts
index 636019b..9904c78 100644
--- a/src/world/Clients.ts
+++ b/src/world/Clients.ts
@@ -19,13 +19,28 @@ namespace Clients {
         }
     }
 
+    export function getKwinDesktopApprox(kwinClient: KwinClient) {
+        switch (kwinClient.desktops.length) {
+            case 0: // TODO: is empty = all desktops?
+                return Workspace.currentDesktop;
+            case 1:
+                return kwinClient.desktops[0];
+            default:
+                if (kwinClient.desktops.includes(Workspace.currentDesktop)) {
+                    return Workspace.currentDesktop;
+                } else {
+                    return kwinClient.desktops[0];
+                }
+        }
+    }
+
     export function isMaximizedGeometry(kwinClient: KwinClient) {
-        const maximizeArea = Workspace.clientArea(ClientAreaOption.MaximizeArea, kwinClient.output, 0); // TODO: pass desktop
+        const maximizeArea = Workspace.clientArea(ClientAreaOption.MaximizeArea, kwinClient.output, getKwinDesktopApprox(kwinClient));
         return kwinClient.frameGeometry === maximizeArea;
     }
 
     export function isFullScreenGeometry(kwinClient: KwinClient) {
-        const fullScreenArea = Workspace.clientArea(ClientAreaOption.FullScreenArea, kwinClient.output, 0); // TODO: pass desktop
+        const fullScreenArea = Workspace.clientArea(ClientAreaOption.FullScreenArea, kwinClient.output, getKwinDesktopApprox(kwinClient));
         return kwinClient.frameGeometry === fullScreenArea;
     }
 
diff --git a/src/world/clientState/Floating.ts b/src/world/clientState/Floating.ts
index 631824c..3408ee6 100644
--- a/src/world/clientState/Floating.ts
+++ b/src/world/clientState/Floating.ts
@@ -24,7 +24,11 @@ namespace ClientState {
         }
 
         private static limitHeight(client: ClientWrapper) {
-            const placementArea = Workspace.clientArea(ClientAreaOption.PlacementArea, client.kwinClient.output, 0); // TODO: pass desktop
+            const placementArea = Workspace.clientArea(
+                ClientAreaOption.PlacementArea,
+                client.kwinClient.output,
+                Clients.getKwinDesktopApprox(client.kwinClient),
+            );
             const clientRect = client.kwinClient.frameGeometry;
             const width = client.preferredWidth;
             client.place(