If you’re on the beta, under Taskbar settings > Taskbar behaviors, you can now select options under Show smaller taskbar ...
Microsoft is testing a new taskbar icon scaling feature that automatically scales down Windows taskbar icons to show more ...
Create a System Restore Point first, so that you have something to fall back on ... may have to enable icons for each account. Read: System Tray icons do not work. Windows 10 users may open ...