I cannot see the image, so I don’t know why the tools would have vanished from the right side. If you can email support@gentlemencoders.com with the screenshot, I can take a look.
Sounds like a bug I ran in to as well where if you enter the mask menu then try to return to editing tools all the tools on the right slide up and off the screen.
If it’s the same issue, looks like a fix is in the beta 2025.08 (125).