When you edit your preferences to add favorite tags, you have to type the tag names by hand. The request is for the same matching/auto-complete that we have for posts. A complication is that the profile applies to all categories on the community, so the options would have to come from the union of all tag sets in use on the community. That might make it hard or slow. This is a low-priority request.
https://meta.codidact.com/posts/287109
When you edit your preferences to add favorite tags, you have to type the tag names by hand. The request is for the same matching/auto-complete that we have for posts. A complication is that the profile applies to all categories on the community, so the options would have to come from the union of all tag sets in use on the community. That might make it hard or slow. This is a low-priority request.