Thanks for asking.
If you are using latest version of Pro Theme and designed the page after version 2.3.0 then Pro Theme comes with version Action history (undo/redo feature). To learn more you can take a look at following changelog page:
In case you designed the page prior to version 2.3.0 and have saved the page as template then you can import the template to rollback. To learn more, you can take a look at template manager article:
If you have backups running on the server then you have the option of rolling back the website to that earlier stage to rollback the changes. However, please note that using backup file will rollback the entire website not just the page in question. To learn more, please take a look at following article: