MacOS Mojave - Mail->Preferences Window is blank
I recently upgraded to MacOS Mojave on my MacBook Pro (13-inch, Late 2013). When I try to change my Preference in the Mail app (Mail -> Preferences), the Preferences window opens but is completely blank. I cannot see any menus, buttons or options. I was able to change my preferences the day after the upgrade. The Preferences window went blank after that. I cannot change any preferences in my Mail app. I've tried restarting the Mail App and even my MacBook Pro several times. The issue persists. What is the best way to resolve this issue?
MacBook Pro with Retina display, macOS Mojave (10.14)