Hello,

Thank you for using Infragistics forums!

While the Responsive feature has multiple distinct functionalities that help achieve better user experience for RWD-conscious apps, in most configurations it also assumes that the grid has dynamically sized columns that could become too narrow to be easily readable, which then kicks behaviors that help alleviate that. Grids with horizontal scrollbars don't need this basic Responsive functionality so one thing you could always do is disable Responsive (what do you need it for in such a grid?). You could also try to turn off forceResponsiveGridWidth. 

If the first is not an option and the second doesn't work, please share your TreeGrid and Responsive configurations so I could check what the underlying cause for the issue is.

Best regards,

Stamen Stoychev