When I select items in the editor, the whole item changes colour

Development Platform & Builds
, , ,
1

When I select items in the editor, the whole item changes colour, like so:

https://snake.dog/s/mecuy/fehod.png

but when i see screenshots of other people using the editor, it only highlights the outline of the item:

https://snake.dog/s/dinup/diyud.png

what’s going on?