DisplayLink Forum - View Single Post - macOS Tahoe – Window maximise leaves phantom Dock space on multiple DisplayLink displ

Szymon · 04-03-2026, 10:26 AM

Hi holtond,

This is a very detailed report. Since this behavior isn't consistently reproducible on other macOS Tahoe/DisplayLink configurations (at least on our side), it suggests a localized WindowServer geometry mismatch where macOS is 'remembering' a Dock footprint on a screen where it no longer exists.

Check Mission Control Settings: Ensure that 'Displays have separate Spaces' is enabled in System Settings > Desktop & Dock. If it is already ON, try toggling it OFF, logging out, and then toggling it back ON. This forces macOS to recalculate the 'Available Area' for each individual monitor.
The 'Dock Flush' Technique: Change the Dock position to Left or Right (in System Settings > Desktop & Dock), then change it back to Bottom. This often forces the window manager to 'release' reserved space on secondary monitors.
Primary Display Assignment: In System Settings > Displays > Arrangement, try dragging the white 'Menu Bar' icon to a different screen and then back to your preferred primary display. This reset often resolves 'phantom' UI gaps.

I hope some of it helps.

Regards,
Szymon

04-03-2026, 10:26 AM	#2
Szymon DisplayLink Tech Support Join Date: Feb 2010 Posts: 299	Hi holtond, This is a very detailed report. Since this behavior isn't consistently reproducible on other macOS Tahoe/DisplayLink configurations (at least on our side), it suggests a localized WindowServer geometry mismatch where macOS is 'remembering' a Dock footprint on a screen where it no longer exists. Check Mission Control Settings: Ensure that 'Displays have separate Spaces' is enabled in System Settings > Desktop & Dock. If it is already ON, try toggling it OFF, logging out, and then toggling it back ON. This forces macOS to recalculate the 'Available Area' for each individual monitor. The 'Dock Flush' Technique: Change the Dock position to Left or Right (in System Settings > Desktop & Dock), then change it back to Bottom. This often forces the window manager to 'release' reserved space on secondary monitors. Primary Display Assignment: In System Settings > Displays > Arrangement, try dragging the white 'Menu Bar' icon to a different screen and then back to your preferred primary display. This reset often resolves 'phantom' UI gaps. I hope some of it helps. Regards, Szymon