To sync your Gmail settings, head to Settings > Support and click the "Re-sync with Gmail" button. Note that this will reload Shortwave and bring you back to your inbox.
Shortwave has 2-way sync with Gmail, including many account settings. While most things sync in realtime, specific Gmail settings only sync to Shortwave every 24 hours.
This includes:
It also includes changes made via Google Contacts. You can edit how a sender’s name appears in Shortwave by creating a Google Contact for the associated email address and giving it the preferred name.
Guides
The Shortwave Method
Migrating from Gmail
Compose & send
Bundles
Smart Labels
Shortwave for teams
Billing
Security