Here’s what I found online and it seems to work. On your watch go to the app you want to close and hold the button below the crown until you get the the power off/sos/siren screen. Once that screen appears press and hold the crown button until the window clears back to the dynamic grid. This seems to work.

I finally got 18.1 Beta 2 to load on my iPhone 15 Pro, and here is what I had to do. I put the phone into recovery mode, and when prompted, I connected it to my MBP (M1). It asked if I wanted to update or restore, and I responded restore (make sure you have backed up your phone); my phone was restored to iOS 17.6. NOTE: I DID have Apple Developer 18 betas enabled when I went into recovery mode, and immediately after the iOS install of 17.6, the phone updated to 18.1 beta two, which it did. This takes a while because the restore process removes all of your data ( and apps you installed) and restores from the backup. P.S. My phone just notified me that 18.1 Beta 3 is available for download. Hope this helps

Same