Hi fayth0305,
To confirm, the Notes app on your MacBook Air never fully opens, correct? If yes, the applicable steps below might help resolve this issue with the Notes app:
- "Restart your Mac by choosing Apple menu > Restart.
- Make sure the app is compatible with your version of macOS.
- Check for updates to your software.
- Disconnect any peripheral devices you just connected (for example, a printer). They may not be compatible with your version of macOS.
- Uninstall any app plug-ins or enhancements from other manufacturers.
- If you recently updated the app or macOS, a plug-in or enhancement you installed may no longer be compatible."
Those steps are from this article: If an app freezes or quits unexpectedly on Mac - Apple Support The title of the article may not match what you are encountering, but the troubleshooting and information above is still relevant and still may help.
Let us know how those steps go or if you've already tried those.
Take care.