You can now display thumbnails in Details and Power 
  modes
The new Thumbnail column lets you display a 
  thumbnail for each file in Details and Power modes, giving 
  you the best of both worlds. The new Opus 11 Menu toolbar has a 
  button on it by default to enable this 
  column.
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This new "thumbtails" mode is 
  enabled by simply adding the Thumbnail column to the file display 
  just like any other column. The size of the thumbnail is determined by the 
  width of the column - you can set the default column width using the new 
  Default width option on the Preferences / Display / 
  Fields page. You can position the Thumbnail column anywhere 
  you like, but if it appears immediately adjacent to the Name column 
  Opus will treat the two as a single column as far as selection and 
  highlighting is concerned (as shown in the image above).
The 
  Preferences / File Display Modes / Details and Power 
  Mode pages both have options that let you configure the 
  Thumbnail column's aspect ratio (it defaults to 16:9), whether 
  thumbnails in the column have a border displayed, and whether the file icon 
  should be automatically hidden whenever the Thumbnail column is 
  visible.