Hey Jose,
Thanks for reaching out to us!
The search field at the top of the calendar is actually part of the core plugin. When searching there, results should pull based on the event title as well as the content. By default, you aren’t able to include the custom fields, keywords, categories or any other meta information based on that search field.
The Filter Bar is used to further “filter” that information by the event category, venue, organizer, etc. So it is similar to “search” but rather than inputting the text, you narrow in based on the items selected.
If you would like a search field that does dig further into the different information, check out the SearchWP plugin to see if it functions the way you’re wanting.
Let me know if this helps.
Thanks!