Have the ability to close GM sidebars, but leave Tabletop Chat open

Another suggestion from an interviewee, title says it all!

I like the idea. Having the extra real estate during large role-playing scenes or getting an overview of a map while maintaining a watch on character actions would be very useful.

Oh please, please, please.

A temporary work around, posted by @xBladeRunner as mentioned by @Redmega in Discord: