The empty space next to the event is needed if we want to add new event next to the one that we already have so it should be observed only if the editable setting is not false or {create: false}. If any of these is set the event should be 100%. https://demos.telerik.com/kendo-ui/scheduler/basic-usage
https://dojo.telerik.com/@zdravkov/uWExofIL
the event width takes all 90% of the width of the slot
the event width should take all the width of the slot