Click into "Search" in your left control panel in the "home" view to do a deep search within your account.
You can view search results from within your notes, transcripts, private notes, comments, and attached files.
You can also filter these results to only show meetings with specific teammates, within certain dates, and sort by oldest or newest.
You can find the quick search icon in the bottom left corner in Fellow or use the keyboard shortcut (cmmd K). This allows you to quickly search for something without needing to leave the page you're on to go into the full search view.