I'm editing this post because I found the right documentation about user permissions to apps' sources.
Share a canvas app with your organization - Power Apps | Microsoft Docs
The issue that I was having had to do with data being displayed in the canvas maker interfase while logged in with a Sharepoint site owner account, but when the user opened the app, no data displayed, as shown in the screenshot below.
I simply shared the List with the user and it started working after a few minutes:


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