How to respell one note only?

I know how to do enharmonic for single notes, but I’m not sure is there any solution to respell the notes in double notes?
I just want to change A-flat to G-sharp.
畫面截取 2022-03-25 at 10.17.25 AM
If I do [option+], it would turn out that both of them are repelled.

Welcome to the Dorico forum.

Click on the note(s). If they both highlight, use the up- and down-arrow keys until only the A-flat is selected. Then press option-minus. That should respell the A-flat as a G-sharp.

(PS I assume you meant respelled, not repelled.)

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Also, clicking to select one note in a chord and not get others can be a matter of zoom percentage. There is an invisible hot zone around the tip of the arrow cursor in Dorico. If you zoom in a bit, you can get more precise with clicking.