Cannot edit tags globally

I can only edit a tag in an individual listing.
I can only delete it by going ino all listings with it and deleting individually.

On the bottom left I can see my tags.But all I can do is click one to open all items with that tag.
Rightclicking a tag here just gives me the normal browser rightclick menu.
There are no edit buttons here - the documentation looks very different to what I see: I have no coloured button that would let me either edit a tag or delete it.

Oh I just tried dragging an item on to a tag.It had no effect.
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