Hi Rameez,
I have checked and found the issue you described, and I also found that it is not allowed to create a new page. I assumed there might be some different reasons behind your issue. I would like to suggest troubleshooting the following common issue to help us recognize the reason.
1.Theme Related Issue
2.Plugin Conflict
3.Theme Update related issue
4.Child Theme Related issue
5.CSS/JS Customization
6.Disabling Cache
7.Disabling CDN
If you discover that an issue is coming from a custom code or 3rd party plugin, kindly consult with a developer or contact the plugin author. Please note that we do not provide support for custom codes and 3rd party plugins.
If none of these helps, please copy your live site to a staging server so we can troubleshoot freely without breaking your live site.
And give us access to the secure note including:
– WordPress Site URL & Login URL
– WordPress Admin username and password
To create a secure note, click the key icon underneath any of your posts.
Thanks