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Filters

If no author is selected the value defaults to all.
Decide whether some or all people should be author of the paper.
If no journal is selected the value defaults to all.
Data Source
Categories
Topics are more fine-grained than categories and allow for a more detailed search query. Each topic has several keywords assigned to it which make them easy to find even if you don't use their correct name.
Locations are countries or cities a paper is referring to. Not every paper has an associated location. If no location is selected the value defaults to all.
Reviewed articles were published in some journal while preprints are most often not peer-reviewed but publicly available.