Help ▸ Paragraph Help (F1) opens these pages in your browser, in the language of the app. The Keyboard Shortcuts page lists every shortcut.
Help ▸ Send Feedback… and the round button at the bottom of the window open a conversation with the developers: write a message, attach screenshots or files, and send. Reports that cannot leave right away are sent later.
Help ▸ Show Logs… opens the folder of the logs in File Explorer, in case the developers ask for them.
Help ▸ Check for Updates… looks for a new version; the edition installed from the Microsoft Store is updated by the Store.