Power Wheel

From Mass Effect Wiki

The Power Wheel is the in-game menu that allows the selection of different abilities or weapons for each party member in combat. The center of the power wheel is used as a crosshair for targeting with the menus around the ring.

To access the party's weapons, press and hold LB (left shoulder button). Use the left thumbstick to browse each member's weapons, and press A to equip.

To access the party's abilities, press and hold RB (right shoulder button). Use the left thumbstick to browse each member's abilities, and press A to cue an ability up as an action, which will be used when you release RB. You can also press X to map the ability. Tap RB whenever you want to quickly activate it in combat.