I'm in an ordinary text document. Changed from one column to two, don't ask me how now. Can't change back to one, come hell or high water

I’m in an ordinary text document. Changed from one column to two, don’t ask me how now. Can’t change back to one, come hell or high water. How do I? And if possible, don’t tell me about sections. I didn’t need sections to make it two columns. Why use them to go back?

Go to the menu Format - Page - Columns or Format - Columns and change the number of columns to one.