I'm not sure what you are asking?
Within a Scene's sources, you can always toggle a source to being Enabled (visible) vs not [not sure actual menu terms]. The icon is the one to the left of the Lock toggle in the Sources List
Another option with a Referenced Audio source would be to switch Scenes
so Scene A (or whatever title) has your face cam and Scene B has other video sources
The challenge would be if you are capturing Audio from same source (ex webcam) used for Video
You can change what is display on top of what by moving items with the Source list (the higher up has priority/is on top)
So within a scene, you can move a source up the list (drag and drop works in 25.0.8) to hide another source and make it visible
but beware having multiple source all running at same time and PC has to process/render them.
Without more details of you setup, not sure I or others can advise further.
But OBS gives you lots of options/ways of changing what is in view vs not, or where on screen/size (ie move from full screen to a Picture-in-Picture style)