Groups and resources are normally sorted alphabetically or manual set at the account level. But there are times when you have a list of resources and prefer a different sort order, or a dynamic sort order based on some value.
Sorting Groups
Sorting groups by the name or color allows you to keep groups of similar types together. For example you may have many staff groups and color them all yellow, and all your various equipment groups colored blue. Sorting groups by color will keep the staff and equipment groups together.
Sorting Resources
Sorting resources by color allows you to keep groups of similar resources together inside a master group. For example you may have many a single All Staff group which includes Managers and Admins. Coloring each person with a color matching their role allows you to group by color and therefore role.
Resources can also be sorted by the number of days they are busy or the number of events they are tagged in. This means you can always have the busy or under utilized resources at the top which helps you quickly see who needs more work ensuring an even distribution where needed.