How to set the x-axis of the graph to -2000 of in lung parenchyma analysis?

Thank you for always your help.
I would like to set the x-axis of the graph to -2000 of in lung parenchyma analysis as the report
(Computer-aided analysis in evaluation and grading of interstitial lung diseases in correlation with CT-based visual scoring and pulmonary function tests | Egyptian Journal of Radiology and Nuclear Medicine | Full Text)
I performed parenchyma analysis by Slicer version:5.2.1.
The minimum x-axis was -1000.
Could you please tell me how to set up minimum x-axis to-2000 ?
Operating system:
Slicer version:
Expected behavior:
Actual behavior: