Do you only have access to one plex server and did you disable all Online Media Sources in your plex account?
If so, you could be hit by a known bug which prevents your side bar and your home page from getting populated automatically upon first run.
Which then explains why you have to always go through More... to access all your libraries.
The bug is known and will be fixed shortly in an update.
In the mean time, you can ‘pin’ your favorite (or all) libraries to the side bar, so that they are accessible immediately.
Read more about it here
https://support.plex.tv/articles/navigating-the-big-screen-apps/
https://support.plex.tv/articles/customizing-the-apps/
And here is a video showing how it’s supposed to work.
You’ll see that it is in fact streamlining operation, once it is set up to your liking:
