Show UI was a feature that was left over from the building UI revamp, primarily used by people who preferred the old building UI.
Its appearance was a small persimmon rectangular button with the text "Show Old UI".
Removal[]
The feature was removed on November 2019. The reason for the removal is still unknown to the general community.
In replacement for the old UI, the following keybinds are in place to replace having to press the < and > buttons in the old UI.