Limiting the tag options on a product page?

Site URL: https://shedhorn.com/

I'm looking for a way to limit the tags available for selection on a product page. I'm using Universal Filter to create categories, etc. within the Shop page but the client is having trouble with employees entering options beyond the ones that are "allowed" in the filter. Ideally, I would be able to turn the tags section on a product page into a multi-select drop-down. Has anyone done something similar?

I have no idea, however have you tried posting this to Universal Filter Slack Group? I think you will get answer faster.

Thanks @tuanphan will do.