Once you have clicked on or near a line, it will appear highlighted like in the second image above. Now what do I mean by set? When you type in more than one image at a time, and they only have one "plus" sign in the middle (see image circled in first pic above), I refer to that as a set. Once you click on a line to bring up the arrows, it will surround the whole set. You will enlarge and shrink the whole set at the same time with the arrows. If you don't want this, then type the letter/image, then click somewhere else on your mat. This will "start you over" each time.
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