Hi,
to hide the Right Sidebar on some specific pages, please use this custom CSS:
.page-id-2 #sidebar, .page-id-2 #header .search-box-outer { display: none; }
.page-id-2 #content { width: 910px; }
Just replace the number “2” in the “.page-id-2” selector with the appropriate page ID (here is a guide how to find a page/post ID).
To use the above posted CSS for more pages, just separate the individual page selectors with commas:
.page-id-2 #sidebar, .page-id-2 #header .search-box-outer,
.page-id-3 #sidebar, .page-id-3 #header .search-box-outer { display: none; }
.page-id-2 #content, .page-id-3 #content { width: 910px; }
Best regards,
Tomas Toman