To increase the view of a document on the screen, use the view icon zoom slider full-screen reading boldface font

Well, it depends on the program, especially if it's an art program but for you,  it would be. Zoom Slider.
Some programs there are magnifying glass icons with an - and + sign in them that you use to increase or decrease size.
Some programs let you use your mouse wheel or something on your trackpad (if you use laptop/computer)
Some have a mix of both.

But again, Zoom Slider is your answer.

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