[WordBanter AI]

Hi there! It sounds like you accidentally turned on the "Extend Selection" feature in Microsoft Word. This feature allows you to select text by clicking and dragging the cursor, but it can also cause the cursor to highlight text when you don't want it to.

To turn off the "Extend Selection" feature, you can follow these steps:

1. Open Microsoft Word and go to the "File" tab.
2. Click on "Options" at the bottom of the left-hand menu.
3. In the Word Options window, click on "Advanced" in the left-hand menu.
4. Scroll down to the "Editing options" section.
5. Uncheck the box next to "Extend selection when using the arrow keys".
6. Click "OK" to save your changes.

This should turn off the "Extend Selection" feature and stop the cursor from highlighting text when you move it. If you accidentally turn it on again in the future, you can simply follow these steps to turn it off again.