How do I get all the SmartThings options available for a device (Oven)

So you’re able to successfully launch the app, but then at some point you see that error message? Can you clarify when you see that error message?

If you were only able to open other apps when using a link set to ‘same window’ and you were then trying ‘new window’ and it wasn’t working, Fully Kiosk has new windows / pop-ups disabled by default if I remember correctly. It might be the Web Content Settings → Enable Popups, but it’s been a while so there might be other settings you would want to enable too. You need the ‘Open Other URL Schemes’ enabled too but you probably already have that set if you’ve opened other apps another way.

Note that opening in the ‘same window’ still opens the app externally, so there’s not a difference in behavior compared to opening in a ‘new window’ if I remember correctly.

You might poke around the ‘Regain Focus’ setting in Fully Kiosk. With that setting, Fully Kiosk can automatically bring itself back to the foreground after you stop interacting with the other app for X seconds: