Library Setup
Plex has their own libraries and content. While it's a nice bonus, it's easy to confuse a Plex Library with a custom one that has been shared with you. To remove these:
Go to https://plex.tv and login with your Plex account credentials
Access the Plex Web app by clicking on the "Open Plex" button
Find the hidden Ellipse next to the item you wish to "Unpin" (remove all Plex's items seen in the screenshot)
Click on the "MORE" button to find the server that was shared with you
Please note that the server name can be different depending on which server you were added
Locate a desired library of interest that is shared with you
Click the ellipse and "Pin" the desired library (repeat this step for all libraries of interest)
In the upper left, click the "PINNED" menu item to return to the Home section of Plex
You should see your pinned libraries listed on the home page, you can also reorder them as you see fit
Locate a desired library you wish to move
Click the ellipse and select "Reorder"
Now simply Drag and Drop the Libraries in the desired order
Once all your Libraries are in the desired order, simply click the tiny “x” found here to exit the reorder process
Congrats! You are now ready to enjoy your streaming. It's recommended that you also follow the steps in the Quality Settings guides to get the best experience possible.