New Pages is non-functional. How to get old one back

It would appear that your Pages toolbar is hidden. Go to View > Show Toolbar (it's near the bottom of the menu).

Personally, I like the toolbar in Pages 15 better than previous versions. Some of the commands I like are readily available.

I don't use Pages or Numbers on my iPad, but they are installed. Upon opening a new, blank document in Pages, I do see a toolbar, but it is very limited compared to what I'm used to on my Mac. And I do not see a way to edit it. Sorry.