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How do I increase print size which changes suddenly from readable to too samll to read

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While writing an E-mail, the screen changes suddenly from full screen to a small representation which I can hardly read. Why does this happen and how can I reverse the screen to where it started

While writing an E-mail, the screen changes suddenly from full screen to a small representation which I can hardly read. Why does this happen and how can I reverse the screen to where it started

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Reset the page zoom on pages that cause problems (make sure that the window is not maximized):