Hi Sutthipong,
Greetings from Syncfusion.
We have analyzed your query with the attached screenshot. From that, we are not clear about your exact problem. With the provided information, we have created a simple sample for multi-level labels. In that, we have used negative values for the x-axis and the border is working fine. Please find below sample and screenshot,
Screenshot:
Since we are not aware of your exact scenario which the issue is reproduced. Kindly check the above sample and revert us with following information which will be more helpful for further analysis and provide you the solution sooner.
· Please share your sample (or) code snippet.
· Try to replicate the reported scenario in the above sample.
· Share more information about your exact problem.
· Share your data source file
Regards,
Baby.