Why, "suddenly", can I create only a NON-Copper zone?

(Newbie) I have several times created and filled copper zones after starting afresh with a backup .kicad_pcb. But this time after I click on the Add Filled Zone icon and then on the first corner of the zone around my outline, the dialog window that comes up is Non Copper Zone Properties with the F.Mask layer checked. I’m stumped!

Is your current drawing layer a Cu layer?

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No, it was … F.Mask! Don’t know why it started that way, but no matter. Thanks!