Dynamically Enable and Disable Date Dropdown

Hi lucadelicio , Thank you for reaching out to the Microsoft Community Forum.

Your Filter Period table is completely disconnected from the Date table without any relationship. So, when you change Period, it does not actually filter the Date table, it only affects your measures. Since slicers populate their values directly from the underlying column, the Date slicer has no filter context to react to, which is why it keeps previous selections or shows All instead of becoming empty.

Power BI also cannot dynamically clear or truly disable a slicer based on another slicer in this setup. You would need either bookmarks to reset the slicer, a UI workaround (like conditionally hiding/overlaying the Date slicer) or a different model design where Period physically filters the Date table.