Could you be a little more specific in how you would like to change them?
From the looks of your screenshot you are plotting Transaction performance per site?
Here are a couple of ways you can customise it in the report
If you want to remove the metric name you can go to the results display tab and click on the icon for customize names
You can then either change the name of the metric under general aliases or remove it from the series by putting a - in the chart aliases
You can also change the length of the dimension value and regex parts of it under the custom attributes on the results display tab.
More info on that can be found here https://community.dynatrace.com/community/display/...