ThunderBird

I use ThunderBird for my e mail and I love t.
But I must have Hit or Clicked on something because every time I type some text and hit the Shift Key to go to the next line.

It will just say 2.. lines down to start the new text Run.

I looked in all the Text formatting options but found nothing.

What can I do to give it a None Text Spacing?

 

I use the "Enter" Key to go to the next line.

 

Thank you for getting back to me.

I foundout what was going on.
If I go into Tools then Options then I think it was Format or something like that.
There is a check Box for Let Shift Key start a whole new Text Line or something like this.

I tock the check out and it let me make a new Text Line by hitting the Shift Key 2. or 3. times this is what I like.