The Advanced Search feature was updated during 19R2 as a result of the "Sticky Filters". The search no longer includes several options like Document Type, Study > Study Country > Study Site, etc.
The Sticky Filters was communicated during release notes but not that the Advanced Search would be changing. I have received several reports of negative feedback from users that this is difficult to use.
The same options are available now to perform a search through a combination of Filtering in the Library, and then performing an Advanced Search, but now the process is two steps instead of one and this is proving to be inconvenient for users.
We would like to suggest the Advanced Search be reverted back to it's previous design.