It seems that your content(pref-main-section) is little bit in the side of right sidebar, so if you keep your content little bit in the left sidebar, then we hope your issue will be fixed. To fix this issue please use the following css;
Note: Please use the custom css or child theme to write the css.
We have attached the file, which helps you to fix the issue, so please follow the following steps to fix your issue:
Go to Theme Directory => wp-content => themes => preferential-child => Then paste the file which we have provided to you.
Note: Please unzip the folder first, then only paste the page.php file which is inside the folder.