The user Library folder is hidden by default. In Finder, hold the Option key while clicking the Go menu in the top menu bar. The Library folder will appear in the list.
When Illustrator crashes, it stores backup files in a specific hidden folder within your Mac’s Library. This is the first place you should look. how to find recovered illustrator files on mac
macOS automatically saves versions of files you’ve already saved at least once. The user Library folder is hidden by default