The outlines and borders may not be showing up in OneNote due to one of the following reasons:

1. Check Formatting: Check that you have selected formatting such as font color, bold, underline etc.
2. Check Screen Resolution: Depending on the screen resolution, the outlines and borders may not appear.
3. Check OneNote Version: Check which version of OneNote you have to make sure it supports the outlines and borders.
4. Check Browser Support: Check the browser you are using to see if it supports the outlines and borders in OneNote.