I'll just confirm what @ellativity
said, the visibility of tag categories were removed in a pull request about a month ago, and that category dropdown is gone in the current version of Forem (if you're self-hosting Forem, the next system update will remove this functionality).
The notes on the PR suggest that the Tag's category field/data is not removed, but there's no way to see or set them in the current version.
The implementation of tag categories wasn't very extensible (there was no way to add or move the categories in the dropdown in admin before it was removed, which is what you're seeing) and didn't change tag behavior - the user facing tags page showed all tags evenly, regardless of any category set.
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I'll just confirm what @ellativity said, the visibility of tag categories were removed in a pull request about a month ago, and that category dropdown is gone in the current version of Forem (if you're self-hosting Forem, the next system update will remove this functionality).
The notes on the PR suggest that the Tag's category field/data is not removed, but there's no way to see or set them in the current version.
The implementation of tag categories wasn't very extensible (there was no way to add or move the categories in the dropdown in admin before it was removed, which is what you're seeing) and didn't change tag behavior - the user facing tags page showed all tags evenly, regardless of any category set.