UI settings customization by player

Hello! I'm now making my first game in 2D for android. When i start making UI i understendet the UI can't be costomized by player. So i started trying to make UI settings menu sceen, but yes i'm failed. I want to player can open settings scene and drag all UI elements like buttons, images and text's as he want. Then save and in the game sceen all UI element will be in places where player drag it. These meacanic is in the games: world of tanks blitz, critical ops, PUBG mobile. I will be happy for any ideas or tutorials because i can't find anything in the google. In advance thanks!