Hi Dori,
Strange thing to have the taskbar switch to the right. But rest assured, you can resize the taskbar by right-clicking a blank area on the taskbar, then click "Lock the taskbar" in the context menu, when checked. The taskbar should now be unlocked. Hover over to the top edge of the taskbar, and hold the left mouse button, then drag it downward until you get it back to the right size. You can then relock the taskbar by right-clicking a blank space on the taskbar again, then click "Lock the taskbar".
Let me know how this goes, or if you have any additional concerns, feel free to shoot a reply and I will do my best to get back to you. Good luck!