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Please open Advanced demo, select a task and run in console:
https://www.bryntum.com/docs/gantt/#Gantt/data/TaskStore#function-remove
https://www.bryntum.com/docs/gantt/#Gantt/view/Gantt#property-selectedRecords
gantt.taskStore.remove(gantt.selectedRecords);
https://www.bryntum.com/docs/gantt/#Gantt/view/Gantt#property-selectedRecords
Pavlo Miklashevych
Sr. Frontend Developer