How to get rid off GMSCompat messages?

I don´ t like the "Sandboxed Google Play is running" message. Could not find any setting in app settings.

indiDing Hi! As @mythodical very correctly stated, all you have to do is:

Long-press the notification that says "Sandboxed Google Play is running"
You'll see a "turn off notifications". Tap on that.
You'll see different notifications. You can disable the "Sandboxed Google Play is running" one, and click "Done" on the bottom right.

You should be good to go from there!

I'm fairly certain you can long-press on the notification, go to settings and toggle off its display.

thank you very much!!!!
(after 10 years of android still learning basics ;-))

indiDing My pleasure!