Group by “Assigned to” In SharePoint List
By default the Assigned To allows multiple selections that will not allow you to group by. Just set allow multiple selections to No and then you will be able to Group By Assigned To
SharePoint List Column Ordering not available
Column Ordering in List Settings was not being displayed because i had “Allow management of content types” set to “yes”. So if you set it to No, you will be able to order columns again.