Hi Eusebiu,
Your ticket purchase buttons seem to be where they’re currently located because your theme has placed them there in that sidebar – unfortunately, this means that the only way to change this layout is to manually make some new theme templates yourself, and move the ticketing options to be located underneath the events description.
While we don’t officially support custom design-related things like this, we do have a very in-depth Themer’s Guide which you should check out, it will help you get started with customizing your templates. Check it out here → https://theeventscalendar.com/knowledgebase/themers-guide/
Let us know if that helps, or if you have any other questions or concerns! 🙂
Cheers,
George