Dear VincentKersten1,
Good day! Thank you for posting in Microsoft Community.
From your description, it seems that you want to hide the SharePoint lists which are connected to Power Apps.
If my understanding is right, you can choose to remove user’s permissions to the SharePoint lists, however, will also make it impossible for the users to use the list through Power Apps. However, according to our search, we found the way Timl shared in this thread may help you: Solved: hide sharepoint list from users - Power Platform Community (microsoft.com)
For more details, you can refer to this article: PowerApps Community Call: How to create secure Pow... - Power Platform Community (microsoft.com)
If you have any concerns about it or if you want to learn more about it, please reach out to Power Apps Community - Power Platform Community (microsoft.com) and post a new thread, which is specific channel to handle such situation.
And if the scenario above is not consistent with yours, you can also post back and point that.
Thanks for your cooperation.
Sincerely,
Sukie | Microsoft Community Moderator