Sometimes the default window size is too small to display all of the application screen in the screenshots. You can increase the size of the window Thucydides opens by providing the thucydides.browser.width and thucydides.browser.height system properties. For example, to use a browser window with dimensions of 1200x1024, you could do the following:

$ mvn clean verify -Dthucydides.browser.width=1200 -Dthucydides.browser.height=1024

Typically, the width parameter is the only one you will need to specify, as the height will be determined by the contents of the browser page.

If you are running Thucydides with JUnit, you can also specify this parameter (and any of the others, for that matter) directly in your pom.xml file, in the maven-surefire-plugin configuration, e.g:

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.7.1</version>
            <configuration>
                <argLine>-Xmx1024m</argLine>
                <systemPropertyVariables>
                    <thucydides.browser.width>1200</thucydides.browser.width>
                </systemPropertyVariables>
            </configuration>
        </plugin>
        ...

When the browser width is larger than 1000px, the slideshow view in the reports will expand to show the full screenshots.

Note there are some caveats with this feature. In particular, it will not work at all with Chrome, as Chrome, by design, does not support window resizing. In addition, since WebDriver uses a real browser, so the maximum size will be limited by the physical size of the browser. This limitation applies to the browser width, as the full vertical length of the screen will still be recorded in the screenshot even if it scrolls beyond a single page.

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>2.7.1</version>
    <configuration>
        <argLine>-Xmx1024m</argLine>
    </configuration>
</plugin>