Lenovo ThinkPad E14 Gen 4 User Manual page 22

2. Select the display that you want to configure and change display settings of your preference.
You can change the settings for both the computer display and the external display. For example, you can
define which one is the main display and which one is the secondary display. You also can change the
resolution and orientation.
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E14 Gen 4 / E15 Gen 4 User Guide