Libredraw - how to make a recctangle with exact dimensions

I would like to know how to draw a rectangle when I know the dimensions.

I would like to draw a rectangle 3.75" wide X 80.875 " long.

Is there a way to enter this info, attach dimension lines, and then draw the rectangle to size.

I have adjusted the scaling factor to 1:10

I’m drawing a screen door for my house.

it’s actually this other way 'round.

first your draw Chapter 7, Getting Started with Draw
then you right-click to adjust the size (and position)
rect