is it possible to prune miniature acers?

Is this due to more sun/light on the one side? If it is potted it may be easier just to turn it a quarter turn every couple of weeks. If it is in the ground then pruning may not achieve the desired results? Good luck?!

Millie any chance of a pix?

Why would you want to prune it? These are very slow growing plants?

If you absolutely have to prune an acer, wait until the leaves have dropped in autumn before doing it. Pruning it while it is in growth risks it bleeding to death

Though like Craftnutter I wonder 'why' they take so long to grow