Scratch2.0 has a hidden function. First, hold down the shift key, and then click the earth icon in the upper left corner to find the Import Translation File button and the Set Font Size button where the language was originally changed. Then click this to set the font size and set the font happily. Font adjustment will affect the display effect of building blocks, so just find the most suitable one yourself. However, no matter how you hold down shift and click on the earth icon, this hidden function will not appear in Scratch3.0.