The provided screenshots are not enough for me to determine what is causing the observed behavior. Would it be possible to provide a sample dojo, where I can observe the issue?
In general, the dropdown elements of the DropDownList and the Grid filter menu are wrapped in a container with a class of k-animation-container. You could try and modify the CSS styles for the class in order to achieve the desired result. Note that you might need to use a more specific selector to target a particular container.
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