Well, I think the easiest way to hide UI is to use customizer. Otherwise, to hide some parts of UI you have to deal with lines like this:
prsnt_multiplayer_round_time_counter 3 0 2
-60.0 12 2124 1 1000 2133 2 144115188075856064 -1 2319 1 0 910 3 144115188075856065 0 98308 921 2 144115188075856065 16777215 729 2 1 900 730 2 1 690 926 2 144115188075856065 1 729 2 1 2000 730 2 1 2000 925 2 144115188075856065 1 902 1 999999
And almost every new patch will broke file changes too. Customizer is just doing dirty work for you.
Customizer Update: Gold icon is finally fixed