Qt DS needs to have 'Lite QML Designer' workspace

Qt DS needs to have a 'Lite QML designer' workspace where all extra views apart from

• Form view
• Component gallery
• Property editor

Are omitted. The workspace also needs to have button on the toolbar indicating user will go back to creator when the file is saved and user exits DS session.

The workspace toolbars can also be limited so there is a clear 'close & return to IDE' button on the right instead of the live preview. All other buttons from Qt DS toolbar need to be made invisible.