Hello Harold,

I have been looking into your post!

You can create a style for the ScheduleViewTimeslotHeader and set its Width property to your desired size. When you set width only to the headers the timeslots would be with their original width as the header and the timeslot are presented by two separate elements. This is why you have to create a style for the TimeslotPresenter too and set the width property to the same value as the header.

I have created a small sample application for you the show you this functionality. Please find the attachment and feel free to let me know if you have any further questions on this matter.