Widget not showing up on mobile preview

I have a widget that just doesn’t appear on the mobile preview. The map pops up but the widget doesn’t. I also have a question on why my lighting never works on mobile previews. Is their only a certain light source that you can use. Also the compiling shaders take to long. I don’t want people playing my game on mobile and having to wait just for the shaders to compile its looks bad. Is their a work around for this. Ali just need tips and answers on making sure my game is ready for mobile.