Final Draft is set so that if the last sentence on a page (action or dialogue) will be separated by the page break, it will instead begin that sentence at the top of the next page, like this:
To change this, go to Document > Page Layout > Options tab. You'll see the box for this option; uncheck it and click OK:
When the program is set this way, the next sentence begins at the bottom of the page and is continued to the end of the line, like this:
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https://fd.support/3qnqSji