System Information
Windows 10 or Catalina 15.6
Graphics card: Radeon 580 Pro

Blender Version
2.90.0 Beta (Latest as of Aug 10th)

Short description of error
File Browser doesn't allow sorting of files by "Time" or "File Size". It seems to be locked on "Name" no matter which column you click.

Exact steps for others to reproduce the error
Click "File" then "Open" and then try to sort files by clicking on the header of column.