See this advanced demo: https://bryntum.com/products/gantt/examples/advanced/.
We have the specific scenario where the task Celebrate launch
is starting at March 19.
If we change the start day to Apr 8 we are not able to see the task anymore unless we have the feature scrollTaskIntoViewOnCellClick
enabled and click on the task... Is it expected? See that we are not able to change the horizontal scroll more to the end.