Is there a way to “lock” the text box so text does not run off the page when you are typing?

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Is there a way to “lock” the text box so text does not run off the page when you are typing?

When you are at the spot you want your box to end, left click on the circle until it turns yellow, slightly move it to the right. It will move the edge of the text box a tiny bit from your cursor. When you continue typing, it will return to the next line.