My eyes are getting old and weak. Therefore, I use the commands that Bill Gates gave us. There are two different ones that I like to use.
1. Hold the control key down and roll the roller on your mouse away from you. Each click on the mouse roller magnifies the screen a little bit. Keep rolling until the screen display is as big as you like. Of course, rolling the mouse toward you will make the screen display smaller.
2. This F11 function key command will remove the junk menus from the screen giving you a full screen. This is especially helpful is you plan to stay on one website for quite a while. The menus will return momentarily if you move your mouse arrow to the top of the screen. Hit F11 again and the menus come back.
Try it, you will like it.