Change the height of div that id is “gantt_here”, and the grid height on the left remains unchanged,it is a bug.
In this demo: https://docs.dhtmlx.com/gantt/samples/07_grid/10_scrollable_grid.html
Hello Virgil,
Thank you for reporting about that. We know about that bug. It will be fixed in the future, but I cannot give you an ETA.
As a workaround, you can detect that the height changes and reinitialize Gantt:
http://snippet.dhtmlx.com/f7c63fcde