 To find one of your sources by searching go to the search field on top of your library. Here you can just type in some keywords or you can use the drop-down menu right next to magnifying glass and choose to search only title creator and year all fields and tags or everything. To clear your search hit the X next to the keyword. You can also sort your sources by clicking on column titles. So if I click on title I'll see all my sources are alphabetized. If I click on creator they'll be alphabetized according to creator and you can add more columns too. So if I click the column button I can add date for example or date added which is when I added the source to my library and I can also deselect things so that they don't appear and again just select the column header to sort.