Generally speaking, a user using a tabBar type app expects the tabs to always be there. As such most of our examples use the fact that display objects that do not go into a composer scene group stays on top. We call this feature “HUD mode”.
If you have a global (or faux global - preferred) reference to the tabBar, you can always hide it:
tabBar.isVisible = false
when you don’t want it to show, and then set it back to true when you want it to show,.