You can create a custom CSS rule to change the wrapper max-width on that page.
The rule to add in Main Options > Fonts & Custom > Custom CSS Rule box will be
.page-id-xxx #wrapper {max-width:2000px;}
replacing xxx by the page ID#, and using the max-width value you want
As weaver mentioned, there may be some other features in the theme that would need to be adjusted because of that, but we can address them if they arise with a link to the page in question.
If you have the “Plus” plugin, you could add any menu you want in your page using the Extra Menu shortcode.
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