Cannot add widgets

A

AC Question

So I have an Android Head Unit for my car and it has 5.1.1 on it. I rooted it with KingRoot and disabled Launcher after installing Apex Launcher.

The issue I have is that no matter what I do I can't add any widgets! I hold the screen select widgets and select any widget then i drag it to an empty screen and it pops up telling me that by adding this widget Apex will have access to its content or something like that. There is a checkbox and I select it and hit ok but nothing happens. I try and don't select the checbox and nothing happens. Even tried to use Nova and Arrow Launcher but exactly the same issue there too. I even moved these from data to system but still nothing.

Please somebody help me out I am pulling my hair out with this one. Just can't figure it out.