Unknown Tiny Button on Right Side of Start Menu

[Windows 11]

A few days ago, this tiny "button" appeared in my start menu:When clicked, the button "pops"/shrinks/reacts like a radio options button, but does not change in appearance nor does it appear to do anything: (it shrinks like this while it is held)I am using Windows 11. I would like to identify what this button is/does and remove it.

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