IViewSheetSet

private void SwitchToAutomaticOrder(Document doc, ViewSheetSetting viewSheetSetting)
{
   IViewSheetSet viewSheetSet = viewSheetSetting.CurrentViewSheetSet;
   var sheetBrowserOrg = BrowserOrganization.GetCurrentBrowserOrganizationForSheets(doc);
   var viewBrowserOrg = BrowserOrganization.GetCurrentBrowserOrganizationForViews(doc);
   viewSheetSet.SheetOrganizationId = sheetBrowserOrg.Id;
   viewSheetSet.ViewOrganizationId = viewBrowserOrg.Id;
   viewSheetSet.IsAutomatic = true; // IsAutomatic must be true then views and sheets will be ordered by Browser Organization
}

private void SwitchToCustomOrder(Document doc, ViewSheetSetting viewSheetSetting, IReadOnlyList<View> customViews)
{
   IViewSheetSet viewSheetSet = viewSheetSetting.CurrentViewSheetSet;
   // IsAutomatic must be false, then OrderedViewList will be organized in custom order
   // Note that the moment you set IsAutomatic from true to false, the order in OrderedViewList will be organized by Browser Organization
   viewSheetSet.IsAutomatic = false; // IMPORTANT: IsAutomatic before assigning OrderedViewList
   viewSheetSet.OrderedViewList = customViews;
}