I have red a lot of materials at this moment but I still can't find the answer. I'm trying to do this - https://i.sstatic.net/K7CSr.png
I don't have reputation to post pictures so i will try to explain. A side menu which will open on click (over the game screen) that has a text or buttons on it. It is supposed to be transparent or if it is not achiavable just some color. It needs to interact with the GameScreen. I did a research but i can't find something similar, some kind of table or something. Any idea on that question ?
Since it looks like you haven't tried anything, I will only give you a rough logic of how its going to work.
You want to draw 'something' when the button is pressed. You can use a boolean to check if you want to show panel or not. In your render() method, you can put an if statement which would draw the menu in case showMenu == true. Menu is nothing more than a bunch of images that act as buttons when clicked on specified coordinates so it should be exactly same as drawing any other game element. In your InputProcessor, you can check if showMenu == true then check if the user clicked on any buttons on menu, otherwise if showMenu is not true, just skip the check for menu buttons. When the user presses the show/hide button again, change the showMenu boolean again from true to false or false to true.