Multi-monitor behavior should be tested per display, especially when resolutions or scaling differ. Start-button placement, menu sizing, and Windows taskbar settings interact. A working primary monitor does not establish that a secondary display is configured correctly.
What to do
- List each monitor resolution, scale, and whether Windows treats it as primary. Note any taskbar replacement or docking utility that is also active.
- Test Open-Shell on the primary display with a supplied button and skin. Establish a baseline before introducing custom resources.
- Activate Start on the other displays where the Windows taskbar exposes it. Compare the opening position, click target, and label scaling.
- Temporarily test without overlapping shell customizers. Restore your normal setup afterward and record which combination reproduces the difference.
Check the result
Check both fixed desktop use and reconnection of a dock or external display. Verify that the menu remains reachable when the monitor arrangement changes.
Limits & precautions
This guide does not promise an identical taskbar or menu on every Windows release. Report the actual display arrangement and reproduction steps instead of a general “multiple monitors broken” description.
Questions & answers
Why does a custom button look fine on only one screen?
Mixed display scaling may expose an asset or size-setting problem.
Should I test the built-in skin first?
Yes. It removes a custom resource from the list of possible causes.
Sources & scope
Documentation checked October 30, 2026. These instructions are documentation-led, not a claim of hands-on testing on your Windows build.