Stop the Threading

If you created threaded text but then changed your mind, you have a couple of options in the Type>Threaded Text submenu. With your text boxes selected, choose Remove Threading to break the flow of the text meaning no more text will overflow into the selected text boxes but you otherwise keep the appearance of the text. For example, if you have threaded three text boxes, the Remove Threading option would unlink the three boxes, but all the text would remain as-is. The other menu option is Release Selection. This command removes a selected text object from the thread. For example, if you had three boxes and selected the middle one with the Selection tool (V), then you chose Type>Threaded Text>Release Selection, the text would flow from the first text box to the third text box, skipping the middle box.