>I am now, running build 26100.X
This is same build as current 24H2 so you can leave insider program immediately by deleting WindowsSelfHost -key.
- Open regedit (push Win key and type regedit).
- Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsSelfHost
- On left panel right click that key and delete it.
- Close regedit and restart.
- Check your insider settings to see that it's out of Insider Program.