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I am not sure that I understand your scenario correctly, but I would like to suggest playing with the DisplayedCellsCount property which specifies the number of cells to be displayed in the view.
SchedulerTimescale currentScaling = timelineView.GetScaling();
currentScaling.Format = "dd MMM";
currentScaling.DisplayedCellsCount = 8;
You can modify the size of the columns with SetColumnWidth and GetColumnWidth methods. The values passed to the SetColumnWidth method are proportional and the actual width of the columns is calculated based on them. By default, all columns have a value of 1 and therefore if you set a value of 2 to any column, it will stay twice as bigger compared to the others.
SchedulerTimelineViewElement viewElement = (SchedulerTimelineViewElement)this.radScheduler1.ViewElement;
Please, refer to the Timeline View article for more details and properties.
I hope this helps.
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