Click the person icon (bottom-right) to instantly sign in as a test account — see your studio from every role without logging out.
Bottom-right of every screen (owner / manager with Settings permission). Click to open a panel with all test accounts in your studio.
You're instantly signed in as them. An orange banner stays at the top: "Viewing as {name} — Return to your account." One click returns you to your owner account.
Test account credentials are also listed on the Test Accounts card on the Settings page (with copy buttons), in case you want to log in with them in another browser.