Disable the "screen is pinned" toast notification not rooted tablet I want to disable toast "Screen is pinned" message.
You can setup adb and issue this command:

adb shell appops set android TOAST_WINDOW deny


You won't be having that toast anymore. However, this has the side effect of not being shown any toast that Android package would have displayed, so keep this under consideration.

You can replace deny with allow to revert the changes.