I have problems adapting my game to different screens

hello my name is juan and i'm new in mobile game creation and i got a question i want to adapt my game for different screen resolutions how do i achieve this?

I have seen several tutorials on YouTube but these tutorials scale images not a complete game and I think I have to scale as if it were an image but the options do not appear as in the video I imagine why they are not images.

Can someone help me by showing me how a game is scaled for different screens, not just a menu.

I would greatly appreciate your helpme is scaled for different screens not just a menu