Hi,
I found a bug about the menu item's alignment.
[How to reproduce]
Open https://bryntum.com/examples/gantt/advanced/ with narrow window width. (The settings menu is in the overflow menu.)
Make the window width wider to get the settings menu out of the overflow menu.
Click the settings menu.
[Expected]
The menu items align to the settings button. And able to select the items.
[Actual]
The menu items is on the most top-left of the window. And not able to select the items.
I hope it will be fixed.