I do not believe that you can increase / delete the web client. You have several options:
- You can switch to full-screen mode to provide yourself with even more real estate.
- In Neo4j 2.2 you can drag the viewport to see more
- Also in Neo4j 2.2 you can click the download icon and download PNG or SVG. This is not interactive, but may be useful.
For large views of your data, Gephi and Authentic may be useful.
In Neo4J 3.0.1, there are zoom buttons in the lower right of the screen:

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