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To alter the width of an Android widget in Android Studio, follow these steps:

1. Open your Android Studio project and navigate to the XML file where the widget is located.
2. Locate the widget's layout_width attribute in the XML code.
3. Change the value of the layoutwidth attribute to the desired width. You can use specific values (such as "matchparent", "wrap_content", or exact pixel dimensions), or use relative values (such as a percentage).
4. Save the XML file and run your app to see the updated widget width.