The Browse Search found in the header is a traditional catalog search. How libraries label the search or even making it available is customizable. Libraries can also decide on the fields that are browseable.
Note: The enhancement to differentiate names (personal or corporate) that are subjects vs author (think books by Shakespeare vs. books about Shakespeare) is ongoing. Originally planned for the March 2020 release, it is tentatively scheduled for the third quarter release. Currently, if you are searching in Browse mode, you need to search personal and corporate names in the Author field. You do see subjects with subdivisions in the list of search results, but books with just the "plain" heading include books by and about.
Hughes, Langston , 1902-1967.
Hughes, Langston, 1902-1967 Bibliograpy
Hughes, Langston, 1902-1967 Criticism and interpretation
When to use?
Having a hard time knowing how to spell an author's name? With an author browse search you can type in only as much as you are sure of and be shown a list of results
You want to see an organized list. Compare a Browse subject search for world war 1939 1945 aerial to an Advanced search (limit to subject and experiment with contains or is (exact).
A person returns to your public service desk (no Alma) with a call number that isn't decipherable or complete.
Z711 something PS628 and you think it might be M or N