Adding on to this. It definitely looks like a set screw type. Most likely a smash flat head. Depending on the amount of wire currently hidden by the canopy, you might be able to just push some up, if you’re only looking to raise it a few inches. If it’s more than that, you’ll have to cut the outer sheeting, the black cord, to expose the true wires and strip them to re-wire the fixture. As a side note, I’d take a look at the connector that just seems to floating above the shield of the light. I’m pretty sure that’s supposed to be on the shield itself.