Make Text tab open by default in Android Studio

Open Settings:

File -> Settings -> Editor -> Layout Editor -> check the checkbox "Prefer XML Editor"

In Android Studio 3.0 for MacOS

Android Studio -> Preferences -> Editor -> Layout Editor

Screenshot - Prefer XML Option

In newer versions of Android Studio you can find the setting mentioned by Andrey under Preferences > Editor > Layout Editor. ("Prefer XML editor")

A restart is not required.

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