Trouble with drop down link arrow on pages

Hi all
We are currently working on a blog for our village through a standard free wordpress account (https://moorlinch.wordpress.com), using the theme Hemingway Rewritten.

On trying to make a page that didn’t show in the page list, I must have done something to mess it up.

It was showing with the pages at the top, and a small arrow on the right hand side of any page menu that was a parent to more pages. Once I unticked one page to remove it from the list and saved it as a new menu name it moved all pages onto their own link (even though they showed as under a parent in the background.

So…I made a NEW menu, fixing the parent issue by dragging the children to the side. That worked…it was now showing them as drop downs of the parent but it has totally removed the arrow! How will people know there are more things to see on the pages list without it?

Any ideas? I’m not using any fancy editing, it’s just a basic blog to me and we are not hosting it ourselves.
Thanks!