Step #1: Click on the “Rules” option.

In my canvas, I have added the first template from the “Subtraction” templates wherein I reduced it to 3 rows and 4 columns. 

I also changed the minimum and maximum values of the First and Second operand range to “10” and “99” respectively.

You will also notice that I increased the “Grid item width” so that we can fully see the worksheet. 

This is what the worksheet looks like:

As seen in the worksheet, there are problems that do not involve regrouping. Some problems also require regrouping.

Now, click on the “Rules” option.

A pop-up window will appear and this is what it looks like:

There are two options: “No Regrouping” and “Regrouping Only.” 

Click on the “Apply” button beside “Regrouping Only.”

A green status bar will appear above:

Now, click on the “Close” button.

This is what the worksheet looks like after: