If you want to change the color of current time thumb, you need to click on 'Edit UI Elements' and change the value of the CurrentTimePointerColor property. I attached an image which demonstrates you how you find the property.
You can also change programmatically the color of the property. Please take a look at the following code example:
if (this.radScheduler1.ActiveViewType == SchedulerViewType.Day)
Hope this will help you. Let me know if you have any other questions.
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