Radio buttons are meant to function in a group. For example, if you have 2
radio buttons, "female" and "male", in a group and you select one of the
options, the other option is automatically deselected. So one way to
"unclick" a radio button is by having other radio buttons in the same group.

If you want to be able to select/deselect an option independently of other
controls, you must use a checkbox instead of a radio button.
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S.Y.M. Wong-A-Ton

Hello

Try CTRL+Z to remove your selection