Prerequisites:

Create a Qt Design Studio Project. Add a Qt Quick UI Form. Create a 3D view. Add a view3D, Add Some QtQuick3D/Models (cones, cylinders, cubes, etc.) and scatter them in the view.

• First Test:
  1. Select single or multiple items (using Ctrl+Click)
  2. Right-click on an empty place on the view
• Second Test:
  1. Select single or multiple items (using Ctrl+Click)
  2. Right click on one of the selected items
  3. Right-click on an empty place on the view

I think both tests should have the same behavior? In the first test, you would lose your selected items, but in the second test you wouldn't.