Currently, the Gantt does not support display of multiple tasks on a single row. I've created a feature request item on your behalf in our Feedback Portal: https://feedback.telerik.com/kendo-vue-ui/1449798-gantt-chart-mutliple-tasks-in-one-row
If you want to see this functionality implemented, we would advise voting for it. The more votes a feature request gets, the higher its chances of getting approved for implementation and added in a future release.
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and vote to affect the priority of the items