1. This looked promising, but it's not available in our One subscription, even to superadmin

https://www.zoho.com/crm/developer/docs/functions/delete-junk-functions.html#:~:text=To%20delete%20functions%2C%20Go%20to%20Setup%20%3E%20Developer,delete%20up%20to%2050%20functions%20in%20one%20go.

2.  See linked video
https://workdrive.zohoexternal.com/external/730bcf1070e2b0f17542c303dc650b63867923305bf38bbe4750558765f13a72