As others have suggested, I would usually just set the object’s position via code. However if the object isn’t too far off the screen, you can get the object back to the Stage.
In the Editor, refer to images below. Tap the icon of the object in the title bar. The object selection bar will come up on the bottom. Select the text object. This will change the object to a text object (keeping all the code). Enter a long string of characters as the object’s text. Now go back to the stage. The text object should be much wider than the original object making it overlap onto the screen where it can be dragged back to the middle. Then reverse the procedure to change the text object back to the original object.