This is going to sound odd, but it really *is* the solution to making your Spurgeon Daily Devotional text larger or smaller.
Note: The PC Study Bible Desktop uses your default Internet browser application to control the behavior of the desktop. Because of that, font sizing is controlled by the default behavior of your browser. If you want to alter the fonts, you can do so through the preferences in the browser (see below), but be aware that it will change the default font sizing not just for the Desktop in PC Study Bible, but also when you access the Internet through the browser.
Close PC Study Bible.
Open your web browser (i.e. Internet Explorer)
Click on View
Click on Text Size
Click on a larger or smaller size.
Close your web browser.
Open PC Study Bible.
Spurgeon's text should be bigger now.
If you have version 4.2F or later, you can change the font size from inside PC Study Bible. See KB688.