I'm using business version of office 365 sharepoint 2016. The content search web part is not displaying any results. I want the content search web part to pull the result from the list library on the same page. The only thing I see is the label "Content Search" on my page. Please suggest as to what I need to do. Thanks in advance!
Create a search scope and give URL for your specific document library only in the rule.
Update: you need to create a Results Source and configure query to search in particular library only and configure your Search Results Web Part to use your Results Source.