how to unselect a radio button (in ext search) ?

hi,

i have a field with radio button (use lookup table) and ext search enabled.
i select an option and do a search in the panel.
there are too many results, so i use another search on another field (whatever the field)
now i want to do my search only on the second criteria (so without the first on with radio button)

how can i unselect (un-active) the radio button to have only my second field criteria ? (without clear the total search) ?
is there a key shortcut ou double clic mouse action to “reset” the radio button to no-selected ?

Best regards

Radio box cannot be reset. You need to reset the search and enter other search criteria again.