The app has an easy-to-use interface. Select from the top or bottom taskbar position, then choose small, medium, or large taskbar size.
Click save and see if you like it. If you're not happy, make any changes you want, then click Save again. Although simple, it might be nice to have a reset defaults option. Otherwise, it's small, free, and portable, so Taskbar11 is an excellent option if you don't know where to begin.