To resolve the poor display on the external monitors, try the following:
- Set the LINESMOOTHING system variable to 0 (Off) as a workaround.
- Update the graphics driver to the latest version available from the manufacturer (NVIDIA, AMD, Intel, etc.).
- Update to the latest Mac operating system (Within your version of AutoCADs compatibility: System requirements for AutoCAD for Mac)
- Test using an older version of AutoCAD until the operating system can be updated.
