Dwarf black mulberry pruning help

HomelessKoala starts with ...
Hi everyone, I’m a young bloke who together with his partner wanted to bring back those delicious childhood memories of eating fresh mulberries from a tree and in doing so we have bought our first ever fruit tree a Dwarf Mulberry! :D we are hoping to keep the tree at a maximum height of 2.5m (not including the pot) and would love to hear any advice anyone has on pruning and keeping it at that height while maximising the fruit as we have never done anything like this before! I have posted pictures of the beautiful specimen which with the help of some liquid fertiliser over spring has grown a whopping 45cm since I bought it only 4-6 weeks ago :’) it originally only had two main stems however one of those stems has now grown another 3 offshoots as seen in the pictures :) can’t wait to hear your replies, thank you in advance for your help! :D

Pictures - Click to enlarge
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