If you want to remove the Up/Down arrows in the Taskbar of Windows 11 and show all icons, you can do so via Windows Settings or Drag and Drop.

How do I get rid of Task View in the Windows 11 taskbar? To remove the Task View icon from the taskbar, right-click the taskbar, go to Taskbar settings, and then select the button next to Task ...

To make the taskbar hide automatically when not in use, hit "Automatically hide the taskbar." To modify the Start Menu icon, press Start button style and then Windows 11.