Use the Alignment tools to position the matrix grid on the canvas. The default position is the upper left corner of the canvas, but you can align the grid in a different location if required.
Component Ribbon
Open the Alignment drop-down from the Component ribbon. You can select one of nine presets:
Formatting Panel: Matrix Grid > Settings > Alignment
You can also change the alignment of your grid by selecting an Alignment option under Settings on the Matrix Grid view of the Formatting Panel:
Examples: Aligning Grids
Here, the grid is aligned to the top left corner of the canvas (this is the default grid position):
Here, the same grid is aligned to the center of the canvas:
And here, the grid is aligned to the bottom right:
