Keyword Column in Table View

+1

Also select keywords in search box, and search by several keywords (e.g. papers with keywords A AND B)

+1

+1

Along this theme, would be great to be able to select or search on multiple lists using simple boolean logic, such as AND, OR, NOT, etc. 

+1 for keywords

and

+1 for boolean!

Filtering by key words +1

Being able to see what library each paper is in +1

Both of these functionalities were available in Papers3.  Please reimplement.  

100%

+1 for keywords and lists

Please bring back keywords (aka tags) in table view! Major disappointment now that I have switched from Papers 3

Please bring back "collections" option in the table view, or tags or folder lists. This functionality was very very helpful in Papers 3. There are less column options compared to Papers 3 and that is the one that is definitely needed.