diff --git a/applets/taskmanager/package/contents/ui/ToolTipInstance.qml b/applets/taskmanager/package/contents/ui/ToolTipInstance.qml
--- a/applets/taskmanager/package/contents/ui/ToolTipInstance.qml
+++ b/applets/taskmanager/package/contents/ui/ToolTipInstance.qml
@@ -71,17 +71,17 @@
     readonly property string artist: currentMetadata["xesam:artist"] || ""
     readonly property string albumArt: currentMetadata["mpris:artUrl"] || ""
 
+    width: isWin? units.gridUnit * 16 : undefined
+    height: isWin? width / 1.5 : undefined
     spacing: units.smallSpacing
 
     // launcher icon + text labels + close button
     RowLayout {
         id: header
         // match spacing of DefaultToolTip.qml in plasma-framework
         spacing: isWin ? units.smallSpacing : units.largeSpacing
 
-        // This number controls the overall size of the window tooltips
-        Layout.maximumWidth: units.gridUnit * 16
-        Layout.minimumWidth: isWin ? Layout.maximumWidth : 0
+        Layout.fillWidth: true
         Layout.alignment: Qt.AlignHCenter | Qt.AlignVCenter
         // match margins of DefaultToolTip.qml in plasma-framework
         Layout.margins: isWin ? 0 : units.gridUnit / 2
@@ -171,8 +171,8 @@
     Item {
         id: thumbnailSourceItem
 
-        Layout.minimumWidth: header.width
-        Layout.preferredHeight: header.width / 2
+        Layout.fillWidth: true
+        Layout.fillHeight: true
 
         visible: isWin
 
@@ -249,7 +249,7 @@
 
     // Player controls row
     RowLayout {
-        Layout.maximumWidth: header.width
+        Layout.fillWidth: true
 
         visible: hasPlayer
         enabled: canControl