Ok, I see this has been brought up before... 11 years ago. There were two responses, one was that it will be in a future release - they ran out of time to implement it. The second was a work-around to do the calculation yourself when loading the tasks. Was this ever implemented, and if so -- how would one enforce it?
Applying day of the week visibility to the calendar info, shown below, has not been prioritized to the gantt view. This is considered to be a new product idea.
this.ultraCalendarInfo1.DaysOfWeek[DayOfWeekEnum.Saturday].Visible = false; this.ultraCalendarInfo1.DaysOfWeek[DayOfWeekEnum.Sunday].Visible = false;
You can suggest new product ideas for future versions (or vote for existing ones) at <https://es.infragistics.com/community/ideas>. Submitting your idea will allow you to communicate directly with our product management team, track the progress of your idea at any time, see how many votes it got, read comments from other developers in the community, and see if someone from the product team has additional questions for you. Remember when submitting your idea to explain the context in which a feature would be used and why it is needed as well as anything that would prevent you from accomplishing this today. You can even add screenshots to build a stronger case. Remember that for your suggestion to be successful, you need other members of the community to vote for it.