Sometimes a page template may not include a Title block. In this scenario there's no way to update the page title in the site editor.

For potential solutions we can look at existing patterns. Templates can be renamed via their detail panels like so:

This could work well for pages too, but it would be good to include a way to edit the title in the full screen editor too. Whatever solution is found for that context could be applied to custom templates as well, as they also cannot be renamed currently.

Finally it may be reasonable to surface a rename action in the Command Palette.