I’ve run into similar issues with picklists, particularly for reference fields, where it will default to a value I don’t want and shouldn’t even be available based on filters or security settings.
Is it possible in your use case to default the value to Retail Sales on the model via a condition or model action? Or, if you make it required, can you add None as an option so people have to choose one?
Also, I think it might work better to instead of removing all the values that don’t equal Retail Sales, use a render snippet that declares these are all the values of my picklist: ‘Retail Sales’.
Just had another idea that might be a way around this:
Add two picklists, one that renders if the running user’s Sales Category = ‘Retail Sales’, and one that renders if it doesn’t. On the retails sales picklist, you could override the metadata so that the only option is Retail Sales, and make it required.
Unless your field is in a table…
