How to remove background from Scrollbar of a Combo Box

How can I remove the black background around the Scrollbar from inside the Combo Box? Also it seems that it has a padding but I don’t see an option to change it. In a Scroll Box you have Scrollbar Padding to change this, but it is missing for Combo Box or at least I didn’t found it.

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Setting Vertical Background Image to None doesn’t work as that only applies a background around the ScrollBar but on top of the black background, and not replacing it.

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It turns out that the problem with the black background is not related to the Scrollbar part of the ComboBox, but actually it is a black background to the whole drop down menu, which we don’t have access to change it when it comes to both String and Key versions of ComboBox.

Here is a ComboBox Key, and I set to odd values widgets to have hidden content (1 is visible, as that one is the selected value), and you can see them being black, same color as the background around the Scrollbar.

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Beside not being able to change that color, it also causes another problem, and that being that you can not have transparent colors as they will always have an opaque black background.

Well technically that is not a true black color, rather it is #1A1A1A (26,26,26 out of 255).

So this is a bug or at least it is missing the option to change that color.

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Hello, have you found a way to solve the problem?

I stopped using ComboBox String and switched to ComboBox Key. They made it so that the background is transparent.

You might be using an older version of UE5 or maybe you are usingString?!

I recommend ComboBox Key as it offers way better customization. You can basically make the button and the elements of the drop down anything you want, not just simply text.

With a bit of logic, you can even make them be different in any order, not just odd/even. Every 5th one be pink, and every 7th one be blue.

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Thanks very much for you timely replay and helped me a lot~