Field Parameter Expand/Collapse for Matrix visualization

Hi Jihwan_Kim ,


As per your question, this is an expected behaviour with respect to field Parameter introduced with the GA release of field parameters as of July 2025.
Previously, if using a field parameter in an expanded matrix and switching the dimension or measuring the parameter selected, the matrix would collapse. Starting this month, efforts have been made to keep the matrix in the same state as possible. 

Refer- https://powerbi.microsoft.com/en-us/blog/power-bi-july-2025-feature-summary/#post-30545-_Toc203388693

Hope this helps!