Under When Replying/Forwarding Open Compose In, the following options are listed:.You can choose to open the composer in a new window or new tab or compose inline, from the Compose settings. When you Reply to/ Forward emails, the composer will open as per your preferences. Reply/Forward Behaviour Reply editor view Go to Settings, select Compose to set your preferences for the email composer. The preferences can be set for the default Font settings, Encoding, Reply behavior and so on. You can customize the default preferences for the email composer using the Compose Settings.