Curious apple tree

Hello,
I'm rather puzzled by our apple tree - my boyfriend said he bought it like this but it’s neither an espalier nor fan nor cordon as far as I can tell?
It’s not grown much nor been very productive (perhaps because there are no apple trees nearby that I know of) and I’m not sure how to prune it...
As you can see, the growth is also quite one-sided! It's in a sheltered sunny spot, in stony, free-draining soil that I've added compost and fertiliser too, I water and feed it too.... we only had 3 apples this year!
Could you offer any tips on pruning and pollination to try and save our little tree please?
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For a tree of that size, three apples is about right. Next year you might have eight, the next year twenty. Apples are long-lived trees and they don’t like to be rushed.
Just tie the branches down level for now. Come back next June to find out the next installment of “How to Prune a Stepover Apple Tree”.😊
Ok, so I shouldn't prune it now?! Thank you