Wasn’t actually aware this had been removed myself. There are some workarounds in the thread linked.
From a shell:
cli
sharing smb query (grab the ID of your share)
sharing smb update x (where x = your share ID)
You’re taken into an editor where you should be able to uncomment and modify “auxsmbconf”, please note I’ve never actually looked at this before and am just relaying info from the linked thread. You should only touch these if you know what you are doing! Take appropriate measures to make sure you don’t break access to your share!