You can always change the main domain associated with your domain space from domain settings.
When main domain is changed, you have to again verify domain, re-publish sub-pages for the changes to take effect
1 First step is to make sure you are in the right domain space or navigate to the domain space to which you want to access.
2 Then Click Common Settings from your domain space dashboard.
3 Scroll down to the end of domain settings and under the section "Change Domain" you can enter the new domain and click save.
Make sure you enter your main domain Example: mybusiness.com ✅ and not your subdomain here like sub.mybusiness.com ❌