I have a MacBook Pro 14 and iMac 24.

I use sharing settings on MacBook and sharing screen.

After I connect devices with a thunderbolt cable, I connect from Finder on the iMac to the MacBook and see the display.

But, I see display only in the MacBook's resolution with black borders around it.

How do I fix it?

  • With „fix it“ you mean the resolution of the MacBook screen? It‘s screen sharing, not remote login.
    – nohillside
    Commented Mar 19, 2022 at 9:19

1 Answer 1


You are seeing black boarders because the MacBook display resolution is lower than the iMac display resolution.

You can set the iMac's display to a lower resolution. This will make the window containing the MacBook display appear larger, but does not change the resolution of MacBook display shown in the window on the iMac. Turning scaling on or off has no effect.

If the MacBook display resolution can be set higher than the iMac display resolution and scaling is turn on, then the MacBook display can appear on the iMac at a lower resolution than current set on the MacBook.

You can also choose to use any available VNC viewer. I tried Chicken and found this also did not allow scaling when the MacBook display is set at a lower resolution than the iMac display. However, I did find that RealVNC VNC viewer does allow full screen mode with scaling to remove the black boarders. Both Chicken and RealVNC VNC Viewer are free applications.

Note: This answer was tested using a 21.5" 2011 iMac and 21.5" 2013 iMac connected by Thunderbolt. I do not actually have a MacBook.

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