Pruning
I have a Katsura tree that someone pruned the center out of how can I re-establish its shape. It now has several long spikes but not true center and an empty space on the side.

Pruning to repair it's shape may take some time over a few seasons.
Here is an article that may help you.
https://www.gardeningknowhow.com/ornamental/trees/katsura/japanese-katsura-tree-care.htm
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