No matter where you put your notes in OneNote for Windows 10, you can find them quickly with the Search box. OneNote will search your text, images, and your handwritten notes.
On any page, use Ctrl+F, or tap or click the magnifying glass at the top of the page list.
In the Search box that appears, type your search word or phrase. Below the search box you can choose the scope of your search. You can search all notebooks, the current notebook, current section, or page.
From the Search Results that appear, select the page you'd like to open.