Fonts are for text formatting. Sources is what you mean. :) In this case, image sources.
I handle this by creating an 'overlay holder' scene, putting all of my image sources in it (corner bugs, social media banner, etc) and then add that 'overlay holder' scene to the rest of my scenes as a source itself. That way all the stuff on my standard overlays is in the same place on each scene, and can be easily changed or moved around if needed, while moving all of them across all scenes at the same time.
Alternately, you can just create one scene with everything where you want it, then Duplicate that scene and add all the scene-specific stuff to it. This is good if you have one scene where you want the source elements in a different location than all the other scenes you use (I just duplicate my overlay holder scene when I have one of these come up).
So as a simple example, you'd have Scene 1, Scene 2, and Scene 3.
In Scene 3, you'd have Image 1, 2, and 3.
In Scene 1, you'd add Scene 3 as a Source, and also add a Game Capture.
In Scene 2, you'd have your fullscreen webcam and Scene 3 as a source.
In both S1 and S2, you'd see Image 1, 2, and 3, on top or below the other stuff in those scenes depending on where you placed Scene 3 in the Sources list.
