hello, i have an idea. @Blumiere
you may want to redesign or customize the composer field like the photos above. By taking half of the whole room of Category Field for Tags can solve the “problem” in a small-screen device. Shadow area for Category, lightgreen area for Tags.
Generally, phones have a bigger screen and higher resolustion than those in the passed. It is time to re-enable this feature officially. what do you think about this? @sam