Looking at your site, you use sacconicase theme, which could not be found in the projectdmc.org/themes/ directory, as far as I can see.
– If this was a custom theme, you may have to go back to your developer team and ask them to make the necessary change(s) to the theme.
If you use a commercial theme or plugin and need support, please go to their official support channel. In order to be good stewards of the WordPress community, and encourage innovation and progress, we feel it’s important to direct people to those official locations.
Forum volunteers are also not given access to commercial products, so they would not know why your commercial theme or plugin is not working properly. This is one other reason why volunteers forward you to the commercial product’s vendors. The vendors are responsible for supporting their commercial product. As the developer is aware, commercial products are not supported in these forums.
The link you provided shows your site using sacconicase theme.
/wp-content/themes/sacconicase/
yes, underscores gives you the possibility to give a name to your theme. It’s a starter theme
I recommend asking at https://underscores.me/ so its developers and support community can help you with this.
I would check your CSS for an extra or missing brace opening or closing a @media block. (Been there, done that.)