I may change the font size in work area using ctrl+mouse wheel. Can i also change the program interface size? (I use high ppi monitor)
You can change UI font size in
File | Settings | Appearance & Behavior | Appearance,
Override default fonts
Update: starting with version 2017.2 IDEA/WebStorm support per-display-DPI mode on Windows, but it doesn't work always.
If you experience problems with scaling, try setting UI font to default in
Settings | Appearance & Behavior | Appearance – uncheck
Override default font, if it’s checked.
If it doesn’t help, please add
-Dsun.java2d.uiScale.enabled=false to VM options using menu
Help | Edit custom VM options.