Android Question b4a bridge display over other apps on android 10

Hi,
complete newbie
I tried to install B4A bridge on Android 10 Go,
I get a message
The "display over other apps permission is required ..."
I click OK
And get message
"Feature not available"
"This feature has been turned off because it slows down your phone"
I've looked in Settings > Apps & Notifications > Advanced > B4A-Bridge > Advanced > Display over other apps
It says not allowed and clicking it gives the same messages
"Feature not available"
"This feature has been turned off because it slows down your phone"
Regards, ah