The Grid column menu does not close correctly. When I click the three-vertical-dots icon, it opens just fine. If I click the three-vertical-dots icon again to close it, it begins to close on the mouse down event, but then opens again on the mouse up event. You can close/collapse it completely by holding down the mouse button for a second or two, but as soon as you release the mouse button, it expands back open again. This can easily be reproduced with the examples here:
https://www.telerik.com/kendo-react-ui/components/grid/columns/column-menu/
To close the menu, you can't use the three-vertical-dots icon. You instead need to click somewhere else on the page, which closes the menu. You can also click either the Clear or Filter buttons and that will close the menu as well.
I'm using GridColumnMenuCheckboxFilter. I searched for a long time for a solution to this, but I didn't find any mentions of the problem. I've noticed that older examples on stackblitz that use older Kendo versions do not have this problem. With the older versions, you can click the three-vertical-dots icon once to open the menu, and once again to close the menu, as you'd expect.