[][Xperia 10 II] Show above other apps - Feature not available

Hi @All,
currently I am playing around with my Xperia 10 II and figured out that some Android apps require the “Show above other apps” feature, which I cannot activate also not in MicroG settings.

When trying to active I get the following message:
“Function not available - This feature has been disabled because it slows down your smartphone.”

Is this feature not yet implemented, or do I have to change some configuration?

Thank you and best,