Volume Scrolling?

[Exceptions]

Hi. Not the most sophisticated user.

Mac desktop, latest OS, 
Bluetooth mouse
Latest Jellyfin
Safari web client

Not long ago, a new feature appeared while using the web client. When the mouse is moved a tiny bit, the volume drops. A more careful application of mouse movement brings up a tiny window with a horizontal volume control activated by the scroll wheel. 

Is this a Jellyfin feature? And how can it be deactivated?  I like to weed out the applications first….

Thanks all

[gnattu]

There is no such feature iirc, the only thing being introduced is the volume control via mouse wheel. Is that your mouse wheel being triggered during movement?

[Exceptions]

There is no such feature iirc, the only thing being introduced is the volume control via mouse wheel. Is that your mouse wheel being triggered during movement?

It seems to only appear in the Safari client, when it's playing back a video! The normal volume control is in the bottom control bar, and scrolling the mouse produces a new horizontal control undneath the cursor.