Drawing a line in sketch mode problem

When I draw a line in sketch mode I use to be able to type the length of that line manually.  Now when I finish the line (2 clicks, one to start the line and the second to end it) it wants to start a second line after the second click.  It use to let me type in how long I want that line to be when I finished drawing it.  Is there a way to change it back?

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