White space in sidebar

Good afternoon, I am creating a website with Syney and there is a white space where there would be a sidebar. I do not want to include a sidebar and would like to know how to make the text appear across the whole screen.

The website is http://constelacionesfamiliaresgranada.es

Many thanks

Dear Ruth,

Please enable the “Front Page” template option on the blow path:

Edit page > Page Attributes > Template


Many thanks!