Table formatting persists

I am copying text from a document in my research folder that’s formatted with tables. When I paste in the upper text window (I have them split horizontally), the table formatting comes along with the text – in other words, even if I select only text, it pastes in a box. I am then unable to get rid of the box formatting even in the main text window (I cannot, for instance, copy out the text and then delete the box).

Does someone have a workaround for this?

Format -> Table -> Remove Table?