You can change the row in which the object is placed.

Here Button 1 is placed in Row 1 of a two-row layout:

You can change the column in which the object is placed.

Here Button1 is placed in Column 1 of a two-column layout:

You can set the object's alignment in the row/column cell it is placed in.

Here the button is aligned in the center right:

You can set the width and height of the object in the row/column cell it is placed in.

Here the button fits the height and width of the cell:

Use Flow to set the direction in which objects are placed.

Here the buttons are aligned to center right and their Flow attribute is Down:

Here the buttons' Flow attribute is Left:

You can set the margins of the object in the layout.

Here the top and bottom margins of the buttons are set to 2:

You can make the object span more than one column or row.

Here Button1 spans both columns of the layout (its Size is Fit to Width):