With the new XL version, I can only occasionally update the the values on the fly.  Most often not.  The added tools are nice to have though.  My system always fails to read the injected strap ... pops and error dialog box to that effect.

I still regret moving to Win10 1903 as I think that's what took away my ability to modify things real-time, while Claymore is running.

You probably need an option or button to revert out of test mode.  Obviously, you can flip into test mode if you don't detect it running but then there's no automated way back out in the XL Win tool.

Edit:

bcdedit /set TESTSIGNING OFF

just in case someone was looking for it.