This OHIF feature request might be good for slicer too - any thoughts?
Yes, many software makes temporary maximization of a single view easily accessible, and I agree that it would be useful to offer this in Slicer, too.
We can already add a keyboard shortcut to change the layout, but keyboard shortcuts are not easily discoverable. We could add an icon in the view controller, and maybe even associate double-click on an empty region to this function (although we already use double-click on image for resetting window/level in the “Adjust window/level” mouse mode).
Yes, an icon in the title bar would make sense - something like the fully screen icon in youtube.
We already have an issue to track this: Add shortcut to maximize the current/focus/active view · Issue #1409 · Slicer/Slicer · GitHub
This has now been implemented in the latest Slicer Preview Release.