This is a bug in my view, however, Rewst support stated, this is by design and to create a feature request for this.
How to reproduce:
Create Sidebar ( No option seen to remove the sidebar once selected)
Sidebar shown as greyed out
Menu shown but no option to remove it
If I remove all the links the Menu still stays there and is not removed
The expectation is that If I add a component, there is an option to remove that. The expectation is not met from a component of (Sidebar). This is definitely a bug as the expectation is not expected.