What happened to fullscreen mode?

I am transitioning from appbridge 3.x to latest 4.

I cannot see any mention of how to get into fullscreen mode - which my app uses in several scenarios.

Closest match I can see is a max’ed out modal. As I can see it, this is how the current admin UI uses behind the scenes when my 3.x app goes into fullscreen.

However, I cannot see any guides on how to transition.
The React design of the 4.x modals are quite odd - as I understand them, the modal needs to be in the DOM tree always, and is then triggered by a show command (shopify.modal.show(..) )
This design is a major headache for me, as I render a 3D context in the window - and this is problematic when I want to show the same content in modal ( due to 3D context restrictions)

Are there any guides or howto’s to how to best get a working fullscreen mode?

thanks
Peter (RealtimeStack app)

We’ve run into the same issue while moving from App Bridge 3.x to 4.x. Fullscreen was part of several flows for us too, and I still can’t find any clear replacement in the 4.x docs.

Not sure if you ever found a workaround since this was posted a while ago, did you end up solving it?

No, ended up not doing full screen for those scenarios. User experience suffered, but I could not see any workaround that would be good enough.