When you increase or decrease the volume on Widows 10, or mute/unmute your speakers, an on screen display alerts you to the change in volume. It appears at the top left of the screen and stays on the screen for a minimum of five seconds. The alert appears on top of everything else you have open and because it’s a system alert and part of the OS, there isn’t much you can do about it. It can’t be repositioned, it can’t be disabled, and it can’t be sent to the back of all active windows. If you don’t like it though you have a few options to make it less annoying such as using Volume Step Adjuster. It’s a free Windows app that lets you adjust the incremental values by which the volume increases and decreases but it also hides the on screen display you get when you change the volume.
Install and run Volume Step Adjuster, increase or decrease the volume and the on screen display will no longer appear. The app works entirely in the background. If you ever want to disable it and get the volume change display back you will need to quit the app from the Task Manager.
Volume Step Adjuster isn’t without its shortcomings. While it can effectively disable the on screen display for changes in volume it doesn’t hide it when you mute/unmute the volume on your system.
By default, when you have Volume Step Adjuster running, volume increases and decreases by 2%. You can of course change this but it isn’t easy since there is no UI for the app. You will instead have to edit the app’s files to do so.