On January 11, BBdoc2021 upgrade, major content is:
Part 1, revised doc, PDF recognition and index update problems
More than 2, increases the filename keyword search function
More than 3, adjust the content of the document keywords expression
4, increase the batch file to delete, copy, shear
5, increase the filename name
6, remember closing the window location and size, for the next launch window size and position of the default