File> Settings> Keymap> under Editor Actions, we can find "Decrease Font Size" and "Increase Font Size" two options. Text and corresponding text larger reduction.
Figure:
Pop-up shortcut: ctrl + alt + s
Move the mouse to the operating frame appears, press the ctrl key, rotating the mouse wheel.
Click the "OK" button to complete the shortcut settings.
It should be noted that the scroll wheel and the direction Decrease Increase must be set to a scroll up, scroll down look.
Click the "OK" button to complete the shortcut settings.