When there are a large number of columns in the exposure sheet, it's not easy to quickly identify a particular column. Displaying the column thumbnails makes this easier. This option displays a small thumbnail picture of the current frame below the column header.
Do one of the following:
|‣||In the Xsheet toolbar, click the Show Thumbnails button.|
|‣||In the Xsheet menu, select View > Show Thumbnails.|
The thumbnails appear.