How can I move the active tab above the background as in the image? And I also want the paper image to stay on top.
The UI sort order is changed using hierarchy. To bring an object to the foreground, place it at the bottom of the hierarchy. Also a child object is in front of his parent.
The Canvas component also has the Sort Order value to sort Canvas together.
So you can either move your object in the hierarchy or switch to another object that is in front of your background.
Sharing the hierarchy could help understand how that UI is build. I personally can’t figure the relationship/hierarchy between the menu and the background with theses two images.