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The SR button refers to the gray right shoulder button on both individual Joy-Cons when it is detached from the Nintendo Switch. The wrist strap that comes with the Joy-Con can be attached to make the button easier to press.
Overview
When using dual Joy-Cons, it serves no purpose and is completely inaccessible when the Switch is in Handheld mode. When using a single Joy-Con, it serves as an equivalent to the R button, acting as a shoulder trigger. In Ultimate, it is used for shielding, much like how the R button is used for shielding in Super Smash Bros. for Nintendo 3DS.
| Controllers and buttons | |
|---|---|
| Nintendo 64 controller |         
|
| GameCube controller |           
|
| Wii Remote (and Nunchuk) |           
|
| Classic Controller | L R        
|
| Nintendo 3DS |            
|
| Wii U GamePad / Pro Controller | L R            
|
| Joy-Con |                
|
| Switch Pro Controller | L R 
|
| Third-party controllers | Hori Mini Pad · Arcade controller · Keyboard |
| Other | Smash Controller · Controller modification |