New Button Slicer Behaviour

Hi mussaenda 

Yes, there's a known issue where the new button slicer works fine in Desktop but breaks or has inconsistent formatting in Power BI Service, especially after the October 2025 update. The most common cause is the feature being in preview and not fully supported in Service yet.
For a quick workaround make sure 'New Button Slicer' is enabled in Service preview features. If using a custom report theme, update your theme JSON to support the latest button states. The 'Grid' arrangement in particular is broken in Service for now.

I believe Microsoft is aware and working on a fix.

For now, manually formatting or recreating problematic slicers after publishing sometimes helps, but is not ideal for larger reports.

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