What is wrong with this Windows volume thing, and how do I fix it?

(really hope I used the right stack exchange site for this)

I appear to have accidentally disabled something to do with changing volume in Windows, whenever I use a keyboard or mouse with any option to change volume (etc volume keys/volume wheel on the logitech g815) nothing happens. The inbuilt windows volume popup on the taskbar works fine, it’s just any hotkey or button that is meant to change the volume doesn’t do so. This could be some option or something to disable the player window that appeared before this issue started happening.

(this example of the window I mean that I haven’t seen since the issue, just found the image on google as an example)