Parent Page/No Side Widgets

Sorry, Use you customize.
If you want to customize the theme, please use the child theme.

https://github.com/mignonstyle/chocolat-child
https://codex.www.ads-software.com/Child_Themes

Thank you.

You can make a separate php file for that particular page in the theme’s directory and remove the function get_sidebar. You can copy the code for this page from another page (for example page.php or front-page.php). I haven’t looked at this particular theme though, but this is how I would have done it.