I have the Sapphire 870Q and use the ¼ " foot part # 412-7855. And try to remember to go into tools and put the stitch width safety on so that I don't forget & try to zig zag with it
I do use the 1/4 "option in the settings when I am attaching my binding with a walking foot.... but I usually move the default over to 2.3 .... (but then when I trim my batting I leave a tad to fill out the binding) .... It took a little practice to get it just where I like it.
Welcome to the forum.... is this machine new to you?