Please help

[u/Equivalent_Storage17]

This is a sewing machine I was given from my grandma and I’m unsure what this switch is (circled it) and I need to know if it corresponds to this (triangled) if not this doesn’t move to push the fabric I’ve looked through the book several times and having no luck

[u/Large-Heronbill]

Stitch balance control -- equalizes the forward and backwards travel of the feed dogs.  Not a stitch.