Board Thread:Support Requests - Getting Technical/@comment-39357137-20200706001240/@comment-5811199-20200721022541

Unfortunately no, it's not possible to use the older interface, but they have been collecting feedback and hopefully they will make some changes in the future.

That's strange that your phone is giving you that interface. Can you try visit the page in the mobile view (rather than desktop view) and then click on the 'Edit page' button? That lets you go to the Mobile Editor, which is much easier to use on mobile.