gantt.ext.quickInfo.hide doesn't work

When I use the hide function of quick_info, the window is not hidden, but appears outside the Gantt chart. What is the reason?thank you!
premise:gantt.config.show_quick_info = false;

There is a bug when you use gantt.config.quick_info_detached = false and try to hide the Quick Info. This issue occurs because of the hard-coded Quick Info position. We are aware of this issue. The dev team will fix it in the future, but I cannot give you any ETA.
As a workaround, you can add the style rules to redefine the hidden Quick Info position:

left: -1000px !important;

Please check the following snippet:

Thank you very much. It’s really helpful to me. In addition, I also found a solution: hide the outer scroll bar, ha ha