Include the right panel when I set my room layout for everyone

### Your use case

#### What would you like to do?

I am organising a game night using Element and widgets. I make use of the new maximised widget feature for the games (widgets), start a voice call (Jitsi) in the right panel and set my room layout for everyone.

#### Why would you like to do it?

I want them to see the maximised widget and the ongoing call when they first open the room.

#### How would you like to achieve it?

Let me include the right panel when I set my room layout for everyone, letting me select a widget for them to see on the right.

### Have you considered any alternatives?

_No response_

### Additional context

_No response_