First, you can hold down the CTRL key and press the + key. Each time you do that, it'll make the text larger. If you get it too large, you can make it smaller by CTRL and the - key. The other way is via the Display applet of the Control Panel, but that affects everything, not just IE settings.
I am using Windows 7 64-bit and Internet Explorer 11 and for some reason the font size has changed in Internet Explorer and I can't figure out why. I noticed a few days ago that the thought was a larger and then yesterday when I went into Internet Explorer the font was very very small and it is hard to read. I tried clicking on view and changing the text size, but that did not make a difference. I am hoping that somebody on here will have some idea what is going on with my system. If you could explain to me how do I go about getting back to my original font I would really appreciate it.

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