Hi,
I have had the same issue some long time ago, and I fixed it by upgrading the DataWidgets module.
Best!
Fjordi
Try inspecting the parent containers in DevTools. In Mendix 10, this is often caused by a stacking context or overflow clipping introduced by sticky columns rather than the dropdown's own z-index.
Even with:
.widget-dropdown-filter-popover {
z-index: 9999 !important;
}
the dropdown can still be hidden if a parent container has overflow: hidden/auto, transform, or position: sticky.
Or try to update the data widgets.