I just want a normal-looking, unbranded folder in my Finder Sidebar.

The current Finder Sidebar shows a rather ugly eye-sore of a logo in place of a plain folder icon, with no way to disable this customization so it pollutes every Finder window. I've tried pasting a new folder icon onto the Box Sync folder in the "Get Info" dialog box as is customary on MacOS for ALL other applications, but Box doesn't respect that icon (or the user's wishes).