Now that you've set up your preferred scene, click save-as and save that preferred scene somewhere convenient that you'll remember on your drive. Next time you start from scratch or upgrade, you can open that saved scene and under preferences-you can save your preferred scene without having to fuss with all the details of getting it the way you like.

As mentioned:

You'll want to set preferred scene in two places. Both edit/preferences/document and edit/preference/interface.

Y'all have a great day.