Open the following directory Steam teamapps common dota 2 beta dota cfg in turn. There is a VIDEO.txt file, in which setting.defaultres setting.defaultheight are two resolution options, which can be changed to the desired value.
Run dota2. There is a setting in the upper left corner of the matching interface before starting the game. The picture scale and resolution can be adjusted. It is recommended that the video card is low. The highest resolution in the 4:3 ratio is recommended
