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Clone mode allows you to send the same content and same color depth, but different refresh rates to multiple display devices, however; the resolution will be the same on both displays.
The display mode that allows you to set different resolutions on different displays is the extended mode.
For more information, you can check the following links:
How To Enable Clone Mode for Graphics Drivers
Setting Up Multiple Displays for the Intel® NUC
Multiple Display Configuration Wizard
Hope this information helps.
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