Exactly what it sounds like. I uncheck “Allow other values” but I have a vague idea it doesn’t work because it’s a reference type.
People can click the “new” which takes them to this:
Obviously I don’t want this, I want someone to select from the pre-determined options. I don’t see how Valid If would help in this scenario either.
I’ve just realised I can sort of hack it by unchecking “show” back in the Repeat spacing table so if someone tries to add a new entry it takes them to a blank screen. Not really an ideal solution.