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There could be several reasons why the custom Action Bar is not occupying the full area of the Action Bar. Here are some possible causes and solutions:

1. Improper layout: Make sure the layout of the custom Action Bar is properly set up to fill the entire width of the Action Bar. Use the match_parent attribute on the layout width.

2. Padding or margin: Check if there is any padding or margin set on the custom Action Bar. Remove any unnecessary padding or margin to make it fill the entire width.

3. Different theme: If a different theme is applied to the custom Action Bar than the main theme, it may cause the custom Action Bar not to occupy the full area. Make sure the theme is consistent across the app.

4. Different screen size: On devices with larger screens, the Action Bar may have a greater width. Ensure that the custom Action Bar is designed to adapt to different screen sizes.

5. Programming error: Check if there are any programming errors that may cause the custom Action Bar not to fill the entire area. Debug the code to find the error and fix it.