[imp] How to get rid of the mimePartInfo boxes?

[Federico Giannici]

I have just installed latest version of Horde/IMP. I'm configuring it 
and I'd like to get rid of the mimePartInfo boxes, that is the little 
boxes to view/save/download every part of the (see the attached image). 
I find it useless and distracting for a novice user, these functions 
could be only in the "Parts" section of the header.

I couldn't find how to disable it. I tried with the following but 
without success:

$_prefs['parts_display']['value'] = 'none';

Is there any way to get rid if those boxes?

Thanks.
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