@TheNorfolkian in order, R3 is assigned by default to: Focus Camera, Special Attack, Lock Target, Secondary Interaction, and Odin’s Sight.
So basically the same for Xbox.

@bielik01 I did some checking, and it seems that there has been a long history of prior requests to update the game with the classic controls that were previously featured in Origins and Odyssey. There’s even one thread that featured a formal response from @Ubi-Woofer on the matter... Customized Control Scheme - Xbox One | Ubisoft Forums

However, it doesn’t look like there are any requests about fixing the default controls to avoid problems like this issue of Odin’s Sight in conflict with Secondary Interactions, so there is a valid opportunity here.