Dear respected William,
Good day!!
I understand your concern that Microsoft Lists is not showing the data as a source connected to a Power App you created but since the concern is related to Microsoft Power Apps, I suggest you post your concern in the related community Power Apps Community - Power Platform Community (microsoft.com) to get the detailed technique support from the experts who are familiar with the icon not showing the expected results.
Apologies for redirecting you to a different community as the members in the category posted focus on the users with the Microsoft 365 and out-of-the-box features and have limited knowledge on the Power Apps platform, so to get the fast and better assistance for your scenario, we have redirected you to the correct community.
In addition, I will keep this thread open so that MVPs in this community may share their ideas and other possible workarounds on your requirement.
Appreciate your patience and understanding. Have a great day!!
Best Regards,
Mia