Your best bet for a wall-mounted iPad is Kiosker Pro. I’ve tried all kiosk apps, including the HA companion app, and Kiosker Pro is by far the most versatile and reliable. You can show/hide any component for a real full-screen experience.
Sure you can. In app settings - you can get there at start when you see gear icon at bottom right for a short time, or in HA settings - phone app settings. Then open general settings and enable full screen there. This will hide top line with battery etc. In HA set side menu to autohide.
Then you can additionally hide all kinds of stuff with kiosk addon from hacs.
Pavel,
I figured it out after all. For some reason changes from Kiosk mode would not show up in companion app so I thought it was for web browser only.
It’s all good now. Sometimes newbies need a little hint. Thank you!