One thing what is really frustrating is the fact that Premiere resets your custom project panel column layout settings. You can still make template of it and manually open it each time, but there should be option to change the which tempalte is default.
I love how Premiere gives you free option (instead of other editing softwares) to modify your workspace as you desire, but this little thing always wastes my time.
Is it possible to have that feature in next version of Premiere
Make a request on the UserVoice feedback system. Others also would like PrPro to save the way the project panel displays things.
Adobe Bug /Feature Request service: https://adobe-video.uservoice.com/forums/911233-premiere-pro