What do screen magnification systems allow a user to do?

Screen magnification systems are specifically designed to enhance accessibility for users with visual impairments by magnifying all or part of the content displayed on a computer screen. This functionality improves users' ability to read, interact with, and engage with on-screen content, thus enabling a more inclusive experience when using technology.

By focusing on magnifying visuals, these systems help users with limited vision to better navigate and comprehend information, making it easier to access text, images, and other graphical elements. The other options provided do not correctly describe the primary function of screen magnification systems, as they either imply a reduction or concealment of information, which contradicts the purpose of magnification.