Current Dev channel build 26120.xxx is based on same codebase as 24H2 (build 26100) so you can do in-place repair/update to get released version 24H2.
Follow these steps to get your device out of insider program and return to 24H2
Download ISO for 24H2
Download Windows 11 (microsoft.com)
Delete WindowsSelfHost -key
- Open 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 its out of Insider Program.
Do in-place repair/update
- Mount downloaded ISO: Double click or right click and select mount
- On new virtual drive run setup.exe to start in-place update
Now you should be out WIP running released version of Windows 11 24H2.