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subject line.
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how to fix this?
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How are you zooming in? Are you using the keyboard, or a mouse? If a mouse or track pad, are you using the scrubby zoom or drawing a rectangle around the area you want to zoom into? Can you post a screen shot showing what your setting are in the main menu?
Have you tried resetting your preferences?
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Using a mouse. On windows.
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Have you tried to reset the preferences as @Chuck Uebele wrote?
If no, then please try to reset the preferences of Photoshop using the steps described here:
https://helpx.adobe.com/photoshop/using/preferences.html#reset-preferences
Please backup your settings before resetting the preferences. You can check:
https://helpx.adobe.com/photoshop/using/preferences.html#backup-photoshop-preferences