To change a control’s size or position, first you would need to select it in Design view. That’s easy: you’d just click it. Small square handles would appear around the selected control. If the control had a label, it would be selected along with the control.
To select several controls at once in Design view, you would hold down the SHIFT key and click on each control you want. You can also click the Select Objects button in the Toolbox, click in the Design view grid, and drag a rectangle around the controls you want to select. When you release the mouse button, handles appear to show your selection.
To change a selected control's size, just point to its border until you see an arrow, and then drag the arrow.
You can use the Size command on the Format menu to match the size of a selected control to its text, the grid, or the size of another selected control.
When you resize a control, be sure you think about the data. A control for price numbers can be narrow, so that it leaves more room for other controls. But a control for addresses should be wide enough to hold most possibilities.
Note The size of the control doesn't affect the data itself, only how the data is viewed or printed.