The big yellow search box on the library home page is known simply as Library Search. It's set by default to find books; articles from academic journals, popular magazines, and newspapers; reference entries; and freely available open-access studies and reports, all available in full text on-line. Streaming audio and video to which you have access too.
Like Google or other search engines you've used, the search terms you enter will likely produce a large number of results. Don't let that put you off—use the filters on the right of the results page to limit to what you need by resource type/format, publication date, subject area, and more.
Once in-person classes resume and the libraries reopen, you can use Library Search to find physical books, journals, video and audio discs, and other formats as well.