Ya, found it eventually; I had to 'loot' something or take it into Inv to get the new 'recipe'...thanks all! Merely equipping the Hammer did not trigger the recipe for this PC player w/controller. I seemed to need to intake a resource, ANY RESOURCE, into Inventory...

Radius seems extremely 'small' in AOE?? I get like 2/3 floor tiles away from the item and the comfort level drops immediately by 1. Still nice to get it to 18 now at least in larger bases or inside by a bed?? lol