Every year Valve organise Dota 2 International tournament and in this time Dota 2 default user interface is changed to International tournament theme. After tournament is over UI si switched to default.
|Theme for International 2|
|TI2 loading screen|
You force game to use The International theme but only for latest tournament.
To switch to latest Dota 2 The International theme right click at Dota 2 in Steam and chose Properties.
Then chose Set Launcher Options and there type:
Next time you start Dota 2 UI will be changed.
|Theme for The International 3|
|TI3 loading screen|