How to remove the little blue arrow in folders?

I'm new to Directory Opus, so I managed to remove the overlay mkv icon, but I also want to remove that blue arrow that appears in the folders, and also in the folder tree.

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Turn off Preferences / File Displays / Folder Expansion / Make folders expandable in the file display.

I don't think they can be turned off. However, their appearance can be changed via Preferences / Folder Tree / Appearance / Tree style.

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Before you remove it, do you know what it does? It’s very useful and lets you look inside folders without having to go into them.