Is it possible to set onItemFound background?

[Maqcel]

Welcome I've run into issue related to setting background for the list of the found items.
In the state without the input in the placeholder I've this design you can see at the 1 photo.
But I can't find the way to make the same black background for the whole scrollable space. Here is the second image for reference. Wish you can tell me the way around the problem.
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