When you hold down the CTRL key while rolling the mouse wheel, text on the screen becomes smaller regardless of the direction in which you roll the wheel.

Question

Quizplus · Accepted Answer

Rolling the mouse wheel while holding down the CTRL key zooms in or out depending on the direction of the roll; rolling up zooms in (makes text larger), while rolling down zooms out (makes text smaller).

When You Hold Down the CTRL Key While Rolling the Mouse