In OneNote, you can use instant search to find specific text, and then replace it with different text using a keyboard shortcut.

    On a blank page, type the replacement text that you want to use. For example, if you’re trying to update a project name in your notes, type the new project name.

    Select the text you just typed, and then press Ctrl+C to copy it to the clipboard.

    Press Ctrl+E to expand the search box in the top right corner of the OneNote window.

    In the search box, type the text you want to find.

    At the bottom of the results list, click Pin Search Results, or press Alt+O.

    In the Search Results pane on the right side of your window, click the first search result (a text link next to a white page icon) to jump to the page where OneNote has highlighted the text it has found.

    On the page, double-click each highlighted occurrence of the text, and then press Ctrl+V to paste your replacement text over it.

    Repeat steps 6-7 for each additional page in the search results list.