Sometimes you might want to delete a section from OneNote 2016. When you delete a section, it’s gone for good so make sure you really want to get rid of it.
Right-click the section tab and click Delete.
If you delete a section and immediately change your mind, press Ctrl+Z on your keyboard. This handy shortcut will undo the last thing you did—including deletions.
If you’ve mistakenly deleted a section, go to History > Notebook Recycle Bin to recover the section.