How can JMeter change the background color?

In JMeter, you can change the background color by modifying the theme. Here are some steps:

1. Open the bin folder within the JMeter installation directory.
2. Find and open the jmeter.properties file in the bin folder.
3. Locate the following line in the jmeter.properties file:
4. # If not specified, the default look and feel will be CrossPlatform. We can set it to System if needed.
5. Remove the hash symbol (#), set the value of laf to “Metal”, and save the file.
6. laf equals metal.
7. Close JMeter and restart it. You will see that the background color has been changed to the default Metal theme color.

Please note that this is just one way to change the appearance and feel of JMeter by customizing themes, including background color. You can also choose from other themes such as Nimbus, Windows, and others.