If you are using static home page on your site then actually the sidebar is at the right side of your site but it’s displaying below the content on static home page because of the issue reported in the following topic.
https://colorlibsupport.com/t/sidebar-at-bottom-of-page/
To resolve the issue download and use the latest version of Activello theme from this page https://github.com/puikinsh/Activello or use the child theme shared in the above topic.