When I have a group of tags in a tagset, I notice that when I'm trying to add tags to a contact I can't see the list of tags (as I would if it was a standard CiviCRM multi-select field).
Instead all I have is the option of keying characters in and seeing possible matches. I guess that approach is OK if all my users know the tags well, but for a new user who doesn't know the tags it's a bit daft, and I'll end up having to produce a cheat sheet with all the tags on it.
Is there a reason why these tagset fields are different from conventional multi-select fields? Is there a simple way to change them so that the tags do appear in a drop-down as well as responding to keyed characters?
I'm working with CiviCRM 4.7.24 and Wordpress 4.8.2, and I see the same behaviour regardless of whether I add tags from the contact summary screen or by editing the contact record.