Dear @chloeval
To be sure before proceeding if you could please make sure on the following points :)
Wordpress, Lay Theme & Laytheme's Addons are all up to date ?
Any Custom CSS or JS that may interfere is temporarily removed.
Any third-party plugins de-activated to see if this resolves the issue.
If using a WordPress Cache plugin, disable it or clear your cache.
License key not activated - (in website blank situations or button not available)
If your WordPress Dashboard shows a warning "PHP Update required"
please update your PHP version in your webhost control panel.
Do any of these apply to you, or remedy the problem?
Talk soon & best wishes
Richard