Hi @fbietlot,
To block the user to use feature like Git version control, you need to trun the Experimental features to off.
Actually, we could only control in it Power Apps app settings.
Experimental and preview features are listed in the app's Settings > Upcoming features. From within the app, select Settings, and then select Upcoming features. Select Preview, Experimental, or Retired features using the available tabs.
Each feature has a toggle switch. Off means that the feature is disabled. Having all switches turned off is the baseline and safest way to run your app.
In some cases, you might need to close and reopen the app after you change a setting. The feature description should indicate when you must perform this step.