The January 2026 SharePoint document library UX update is causing issues with custom JSON formatting. A confirmed bug breaks button visibility when using specific commandBarProps configurations.
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Key Facts:
Rollout: January 2026 (GA)
Confirmed bug: Setting "position" on commandBarProps breaks button visibility (GitHub Issue #10480)
Flow buttons regression: Now prompts for manual Flow ID entry instead of auto-detecting
Workaround: Remove "position" property from commandBarProps until fix deployed
Status: Microsoft investigating
Rollout: January 2026 (GA)
Confirmed bug: Setting "position" on commandBarProps breaks button visibility (GitHub Issue #10480)
Flow buttons regression: Now prompts for manual Flow ID entry instead of auto-detecting
Workaround: Remove "position" property from commandBarProps until fix deployed
Status: Microsoft investigating
Organizations with custom JSON column formatting or command bar customizations should test in the new library experience. The Flow button regression affects lists and libraries that trigger Power Automate flows from the command bar. Users must now manually enter the Flow ID rather than selecting from a dropdown.
Sources: GitHub Issue #10480 · MS Q&A
