Why can't I see buttons in mobile preview?

I can’t see buttons in mobile preview. I do not know why.

This is my menu design.

I see this in “New Editor Window PIE”.

I see this in “Mobile Preview ES3.1 (PIE)”.

Thank You So Much!!

try

It didn’t work. It must be for another reason.
Thank you so much for your response.

thanks mate.

weird… and if you install the game on the phone, there are no buttons?

Yes, on the phone it does work fine. But only if i use compiled APK and OBB and installed on the phone internal storage.

If i try to use the “Mobile preview” i can not see the buttons.
If i try to use the “Project Launcher” i get the following message.

I saw not errors while compiling, only a warning:

honestly? i no idea … i use ue.27.2 (compiled from git hub), everything working


Ok, i’ll try it.
Thank you so much for your help!!