Yes, just change the setting here (but you have to do your own maths 
)
13x2 = 26pt so change the value as shown here:
But notice that you don’t quite get 20 lines on the page, so you can click the “gears” icon to optimize it:
And now the line spacing is just a fraction less than 26pt, but you get one extra line on each page (20 lines).
Hope that all makes sense!
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