@deepak44-
The x and y-axis labels are not the same as x and y-axis titles. They support a different purpose.
Grouping by Active state results in "true" or "false". You cannot update the x-axis label to something else of your choice. You can create x-axis title of your own choice, using the method you have mentioned Style -> x-axis title.
If you still would like to see an option to avoid showing the labels on a report, try changing this report from "bar" type to "pie".
Next, on the Style -> Legend tab, uncheck the "Show Legend". This will allow you to hide the label "true" or "false".
If this is helpful please mark the response as accepted and helpful.
