Hi Lia,
I hope you are well today and thank you for your question.
I could confirm the issue on my test site that occurs when we set Blog page in the site Reading Settings, therefore, notified the theme developer about this so that it will be fixed.
The issue will be fixed ASAP.
In the meanwhile, you can achieve it by adding the following CSS code in the Custom CSS code option of your theme on the below path.
Admin Area -> Appearance -> Theme Settings -> Custom Code -> CSS Code
body.blog div#sidebar {
display: none;
}
body.blog div#content {
padding: 0;
width: 100%;
}
Best regards,
Shufflehound team