Thank you for writing.
I am not sure that I understand your question very well. The horizontal scrollbar will always appear as long as the virtualized container holding the data cell elements cannot fit in the space which is currently available. The row headers are pinned to the left and they cannot be scrolled. This behavior is desired and it is by design.
I am assuming that you might be having too many row headers occupying a large portion of the width of the control. For these kinds of scenarios, I can suggest using the Compact
layout which will arrange the row headers so that they occupy less space. This way, you will end up having more room for the actual data displayed in the control. Please check the following documentation article: https://docs.telerik.com/devtools/winforms/pivotgrid/layout-settings
In case your scenario is different or the Compact
layout type is not suitable please provide me with more details. A short video showing the result on your end would also help.
I hope this helps. Let me know if you need further assistance.