I recently made a pull request(#2347) to move the recent file list to a sub-menu and
received a suggestion to change the value of MaxRecentFiles during the review process.

Accordingly, I modified the code to allow the user to change the value of MaxRecentFiles.
In addition, I re-added the separator that was lost according to the existing patch.

Thank you.

Test Environment

• macOS Catalina (10.15.6, 19G2021)