No, the Beaver Builder plugin is nothing to do with us. It is a completely separate plugin and none of our themes will ever install third-party plugins without permission.
As it would be impossible to develop the theme to take account of all the potentially millions of combinations of theme/plugin/site configurations, in the theme settings there is the option to turn off the headings underline image.
‘Appearance’ > ‘Customize’ > ‘Theme Options’ > [] Disable Headings Underline