During the duplicate file search process, every file's size is noted and checked against the settings defined in the File sizes section of the Search Filtering docking panel.
File size comparison options include:
•Include all sizes - No file size filtering is performed. This is the default.
•Small - Only small files (those less than 100KB in size) will be included.
•Medium - Only medium files (those less than 1MB in size) will be included.
•Large - Only large files (those more than 1MB in size) will be included.
•Specify size - Allows you to specify that only files that are "at least" or "at most" a specific size should be included. You can also specify that files must be "between" two specific sizes to be included.