text will not move back to a text box by using delete,

Hi there, I am stuck on what I hope is a simple problem. But 3 hours has not solved it so I am asking for help.

Usually when I take out a photo or remove some text I just use delete to bring the text back to join up. For some reason that will not work on this page. And when i tried to add another page it had the same format. It is as if the text box ended there, but I can see it does not.

Is there a way to see if I have placed something there that is not visible? Something like in Word when you can see all the formatting details?

I want the text to extend to the bottom of the page. It will let me add text within that page but not bring it back from the next page.

I am getting a message "unable to complete the action you requested when I try to drag and drop a screenshot.