potential fix for screenoverlapping

src/core/UBDisplayManager.cpp

@@ -225,12 +225,12 @@ void UBDisplayManager::positionScreens()
     if(mDesktopWidget && mControlScreenIndex > -1)
     {
         mDesktopWidget->hide();
-        mDesktopWidget->setGeometry(mDesktop->availableGeometry(mDesktopWidget));
+        mDesktopWidget->setGeometry(mDesktop->screenGeometry(mControlScreenIndex));
     }
     if (mControlWidget && mControlScreenIndex > -1)
     {
         mControlWidget->hide();
-        mControlWidget->setGeometry(mDesktop->availableGeometry(mControlWidget));
+        mControlWidget->setGeometry(mDesktop->screenGeometry(mControlScreenIndex));
         UBPlatformUtils::showFullScreen(mControlWidget);
     }