I apologize to those who wrote in and weren't posted. I kept thinking I'd be able to respond and wasn't.
Please read the existing posts for answers and don't forget to check the comments. Several related issues were covered within the comments and there are good suggestions from commenters, as well.
Also, with the new Weebly interface formatting, click around and you'll find what seems to be all the old features behind visually simplified icons.
So, for example, when wishing to change a page type (no header, tall header, etc.), click PAGES, click the page's name in the list, and you'll get all the different types to choose from.
If you're really stuck, you can also call Weebly at 1-844-493-3259, also check out Weebly's blog, Weebly tutorials on YouTube and, if you're adventuring into coding, w3schools.com is terrific.