Hi Katie,
If you’re doing any caching (such as on your server or via a plugin), can you try clearing this out after changing this setting? If not, you can add the following CSS to hide the sidebar (see screenshot):
.tribe-events-page-template #primary {
width: 100%;
}
.tribe-events-page-template #right-sidebar {
display: none;
}
You can add this to the Custom CSS area under Appearance > Customize (if you have one) or to the style.css file of your child theme. Please let me know if this helps!
Thanks,
Jennifer