My organization has blocked the use of the Power Apps desktop client application (Microsoft Store) due to security concerns. This has had a significant effect on our ability to use apps in a true, full screen KIOSK mode.
A suitable replacement for this function would be to have the default M365 title/menu bar auto-hide when hitting F11 in the browser for full screen mode. The bar could reappear on mouse-over, but having it out of the way would eliminate confusion and potential navigation issues for the KIOSK user. It would also be great to have the application fit-to-screen automatically with these actions.