, clicking Control Panel, and then, under Appearance and Personalization, clicking
Adjust screen resolution. Click the drop-down list next to
Resolution, move the slider to the
resolution you want, and then click Apply. Click Keep to use the new
resolution, or click Revert to go back to the previous
resolution.
https://support.microsoft.com/en-gb/help/14108/windows-7-change-screen-resolution
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