Account switching is currently only available on iOS app - but here are some workarounds until the feature is available on all platforms
Sign in to each account in a different Chrome profile (also works on some Chromium-based browsers like Edge).
For your primary account, register for our Android app
For your secondary account, you can add the Shortwave PWA to your home screen.
a. On your Android device, go to app.shortwave.com.
b. From your browser settings, select "Install app" (Chrome) or "Install" (Firefox).
c. Find the app on your Home screen, and sign in!