In HotDoodle, pressing the Enter button creates what is called a hard break and forces the text to a brand new line alike to double spacing. To create single spacing, use what is called a soft break and hold down the CTRL button when you press Enter. A soft break forces the text to a new line, but looks alike to single spacing. Sometimes you may create a soft break, but the text still got forced to double spacing, in this case, you will be able to press the Back Space button and the text will move up under the previous line.
Tip: If you use soft breaks to change the spacing for exiting text, other lines of text below may automatically appear to have double spacing again. Start from the top of the text and work your way down when adjusting the spacing.