How to Align and Distribute objects equally

I used Step and Repeat to create 9 squares in a 3 x 3 pattern.
They are not aligned equally however.
I tried using Align and Distribute but cannot space them equally at 0.5"
I can do a row of them but not 3 rows and and 3 columns in the pattern seen below.

Question: How to align and distribute equally?

See files here:

Image of the 9 squares:
https://davidswebsite.com/corel/9_squares.jpg


The .cdr file:
https://davidswebsite.com/corel/9_squares.cdr