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Make the following changes to RoundCube main configuration:

%%LOCALBASE%%/www/roundcube/config/main.inc.php

1) $rcmail_config['skin'] = 'mvision2_en';

2) Remove "size" and "flag" (flag will still appear however) items:
   $rcmail_config['list_cols'] = array('subject','from','date','attachment');

3) $rcmail_config['preview_pane'] = true;

4) Add new configuration line:
   $rcmail_config['preview_pane_vertical'] = true;

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