(Please ask one question per thread.)
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When you are in the root of a network server (i.e. \server rather than \server\share or below), the display of that special folder is delegated to Windows Explorer and Opus does not have much control over how it looks. Explorer has headers when in list mode, at least when hosted in other programs.
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We'll look into that.
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Grouping of the Computer folder is optional, as in a normal directory. Right-click the file display and choose Group By > None, then use Folder Options > Save > For This Folder.
The colours of the group header can be set under Preferences / Display / Colors and Fonts: File group header.