Using the equation editor to embed a matrix equation into text. The biggest matrix offered in the tool bar is 3x3. Is it possible to make a bigger matrix?

I want to make 6x6. I have tried making a 2x2 and then putting a 3x3 matrix into each place holder cell. That works, but that does not preserve alignment when I insert symbols into the place holders.

Any suggestions?

I don't know the answer to that, but have used Design Science's MathType, which is the big brother of Word's Equation Editor, for many years. It is moderately priced and much more capable.

Since nobody else knows, I've found the answer myself.
In equation editor open up a matrix. By default this is in "professional" mode, so it looks like a matrix.
Right click the matrix area and click "Linear". This turns it into a string of &&@, where & is the matrix cell placeholder and @ indicates the last cell in a row.
So just add more &'s and @'s to increase the size.

Easy enough once you've figured it out, but a bit of help in the "help" would be nice please Microsoft!

... and much easier to use.