With desktop and laptop devices, there are simple options for changing your screen resolution, usually found in the display settings of your computer. It’s different if you use a Mac computer compared to a Windows computer, but you can generally adjust your screen resolution settings in a couple of clicks.
For example, if you use an iMac with a 21” non-retina screen, the usual (default) resolution is 1920 x 1080. If you struggle with the size of the content on your screen and don’t want to have to zoom in different applications, you can choose a lower screen resolution (e.g. 1600 x 900). Doing this will make everything on your screen appear to be larger. Just click on Display in the system settings panel, select “scaled” for the resolution, and choose the resolution you want.