Hello,
I used the plugin as described in your example, yet my export looks like the one attached. I also attached my proejct for your reference. When you export the scheduler the file is storede at "dummyProject/scheduler/exportPDF/output"

Also trying to create export to png in your example doesn't work. "There was a problem creating the file".
I'm using version 5.1.2

Thank You!!!

I didn't find the right solution from the Internet.
References
https://www.bryntum.com/forum/viewtopic.php?f=39&t=8986
animation videos