Camera User Settings are not something new, but if you’ve never used them before you can save a nice chunk of time moving between different setups. User Settings are a group of pre-configured groups of settings (C1, C2, C3 on Canons, U1, U2 on Nikons) that you can activate with a click of a dial.
Usually, those settings are found at the setting dial (the one with S, A, M, P) so you can move between them by rotating this dial. This configuration does two things for you: a) it saves time, as all relevant settings for a scenario are grouped together and b) it helps to make sure you are not missing any critical god-forsaken setting.
Videographer Aaron Tremblay shares how he sets his camera (A Canon 5Dmk4) to work with Camera User Settings. Similar settings can be done with Nikon’s by hitting the setup menu, and clicking on Save User Settings then selecting (A), (B).