Working with Power Data Recovery's file/folder tree is simple - you can walk thru the tree in the left pane, seeing files in the right pane, with the name, size, date and time. Main goal here is to select all files and folders you want to recover.

Maximize the Power Data Recovery application window now, in order to see more details on files and folders you are going to recover.
Open folder trees by clicking the plus signs to the left of folder names in the left pane. Select a folder in the left pane, and its content will be shown in the right pane. All columns in the right pane are resizeable (use your mouse on header of columns area). Headers of columns are clickable, you can change sorting order for the list of files by clicking header of the column. 

You have the ability to filter files by selecting the Apply Filter button. By using filter options, you have the ability to view only those specific files you wish to view. You can find for files with Find File buttons on the right panel of the Power Data Recovery application window.

In Undelete Recovery module, only the deleted and lost files will be listed in the file/folder tree.

File Preview

Click "View as Text" will display the file content as text (only support .txt and .rtf file.).
Click "View as Image" will display the file as a image (support .bmp, .gif, .emf, .jpg, .tif, or .png and etc.). 
Click "View as Video/Audio" will play a video or audio file (all files are supported if a proper codec is installed on the system).
The "Quick Previewer" supports image file and Microsoft Office Word Document, Microsoft Office Excel file, Microsoft Office PowerPoint file and Adobe PDF file.

NOTE: The "Quick Previewer" could display the first page of Microsoft Office Word Document, Microsoft Office Excel file, Microsoft Office PowerPoint file and Adobe PDF file only.