Taskbar Icons Small New! -

: Locate the Show smaller taskbar buttons dropdown menu. Always : Keeps icons small at all times.

A free, open-source tool that brings back the Windows 10 taskbar style (and small icon support). taskbar icons small

Taskbar icons keep getting smaller - Microsoft Community Hub : Locate the Show smaller taskbar buttons dropdown menu

Note: On Windows 10, you can achieve this instantly via Settings > Personalization > Taskbar > "Use small taskbar buttons." "Use small taskbar buttons."