Why is it possible to change the magnification of the object under consideration when working

Why is it possible to change the magnification of the object under consideration when working with a microscope and not when working with a magnifying glass?

A magnifier and a microscope are magnifying devices, and therefore their main parts are magnifying glasses. But, the magnifier has only one magnifying glass and it cannot be replaced. In a microscope, magnifying glasses are located in the eyepiece and objective. These parts are removable. Therefore, with different combinations of lenses in the eyepiece and objective, you can get different degrees of magnification of the objects under consideration. To determine the magnification of a microscope, you need to multiply the numbers written on the eyepiece and objective.