in the columns-definations it is possible to activate and deactivate defined field-rows from the view with marking or unmarking a box.
In the tag-panel you have to delete the tag-field in order to get it out of view maybe only for some periods of work, which makes it necessary to define the field later again.
I suggest to extend the tag-panel-options with activating and deactivating in the same way like in the columns.
I've went a little bit further in v2.88d: you can now enable/disable the individual fields also via the right-click context menu directly from the Tag Panel.