hello @GBCronin,
if you navigate to https://{{your_instance}}.tulip.co/account-settings/player, you can enable the following setting:
Hide “App Completed” and “App Canceled” messages in Player
as a note, this will prevent the App Completions toast messages to appear across your instance.
you can view more information here: [Tip of the Week] Defining Player Settings.
hope this helps, let us know if you have further questions!!