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You are using a commercial theme, please refer to their support forums for help. You may want to start by searching for help with setting the page template for your theme.

Commercial products are not supported in these forums.

>> This part on the page interrupts its look, <<

Please explain.

please be the first person to ask in your theme’s support forum at https://www.ads-software.com/support/theme/rich-store-lite/

there could be a way by adding CSS (for example via ‘Apperance – Customize – Additional CSS’):

.page-id-274 #sidebar {
    display: none;
}
.page-id-274 richstore_singlepage_pagecontent article {
    width: 100%;
}