start a new project
click on the tab: quilt-new quilt-vertical strip (at the top of the page)
Now click on the tab at the bottom of the page that says layout
you will notice that one column is high lighted, you can change the width of this column with the slider to the right. Click on the next column..etc...
Now for the blocks. to the right on the same page is a drop down that is titled: strip style and size. Here you can choose what goes into the columns. Click on pieced blocks and adjust how many blocks per column in the drop down below.
By changing the width of the column and the number of blocks in the column, you are changing the size of the blocks :D:D:D