I cannot select more than one sequence in Project Manager

[WongJo]

I about the archive the whole project with many sequences, and when I open the Project manager window. It will not let me select more than one sequence to backup. As soon as you check more, it will uncheck the previous one. Any suggestion or solution to this? 

[RobShultz]

You may want to try resetting preferences: To reset Adobe Premiere Pro to its default settings, you need to reset the preferences. You can do this by holding down the Alt (Windows) or Option (macOS) key while launching Premiere Pro. This will prompt a dialog box asking if you want to reset your preferences. Click "OK" to reset to factory settings,