If you want to explore the content available on Lexis Advance prior to searching, my recommendation is to download the Content Listing and access it from your desktop.
To do this, sign in to Lexis Advance and access Help via the global navigation bar:
You will find the Content Listing directly under the Search Bar, at the far left of the page:
Open the PDF and save it to your desktop.
The Content Listing is current as of January 2019. You can easily verify that the specific content you need is on the Lexis Advance service before you begin your search.