Windows 11 insiders can now test moving the taskbar to the side of the screen

Microsoft is now testing the option to move the Taskbar to the side of your screen on Windows 11.
Windows Report

Windows 11 Preview Builds Reveal Smaller and Resizable Taskbar

Windows 11 preview builds hint at a compact taskbar mode with proper resizing controls and movable functionality.
XDA Developers on MSN

Microsoft just fixed the two biggest grievances I have with Windows

And I couldn't be happier.