One of these changes that not everyone is accustomed to is the inability to change the size of the taskbar and Start menu icons, which prevented users from customizing the system interface, because Windows 11 was originally a development for Windows 10x, and Microsoft previously developed it to work across Dual screen devices.
This makes the design of the screen and desktop in general, and therefore the toolbar and icons simpler than usual, but after stopping the development of Windows 10 X, the company modified it to fit the usual devices, and then migrated the system interface elements. It became difficult to make changes to customize the taskbar in the short period between uninstalling Windows 10 X and launching the new version.
The company made the decision to launch the new system after making the necessary adjustments to fit the single screen, but it did not focus on customization as it was in the previous version.
However, it is highly expected that the company will offer more customization options in future updates, including the ability to increase the size of application icons and the new Start menu, taskbar customization options in Windows 11 and so far there is no option to resize taskbar icons or the Start menu officially from company.
However you can move the icons on the taskbar including the Start button to the left side of the screen like it was, and if you think Microsoft should make the taskbar and Start menu more customizable in the new OS, the best course of action is to send your feedback using the Feedback app Hub that comes integrated into the system, or communicate directly with the company via their Twitter account.