Cannot always add View3D to navigator when navigator is detached

Adding View3D to navigator is slow and sometimes impossible since detached navigator goes behind design studio window, see attachment. Steps to test:

• Create a project
• Add QtQuick3D import
• Detach navigator view
• Drag and drop View3D item from item library to navigator
• -> Stop/item not allowed to drop - icon is there for a long time not allowing to do the drop. Sometimes drop eventually succeeds but sometimes navigator view ends up disappearing behind Design Studio window.