The size and placement of controls can be directly manipulated in the UserForm window of the VBA IDE.
To move a control, simply select it and drag it to its new position on the form.
To resize a control, first select the control by clicking on it once. When you select a control, its border becomes visible. To resize the control, simply select one of the sizing grips now visible on the border and drag the grip to a new position. When you release the grip, the control is resized to that location. (You can resize the form in the same manner.)
To move or resize several controls at once, select each control while holding down the Shift key. This will highlight all the controls. You can now move or resize the controls as a group.