With appropriate Controller!  

L2      Show/Hide status
R2      Sound on/off 
L       Toggle Joystick Number
R       Change Mouse Speed 1 to 6 
SELECT  Toggle Mouse/Joy mode 
START   Show/Hide Virtual Keyboard 
A       Joystick Button 1 / Mouse Left Click
B       Joystick Button 2 / Mouse Right Click 
X       Not Used
Y       P-UAE GUI 

Personal thanks to qclart!
You can refer to his faq in the Extra Notes section for more details on controls:)

https://old.reddit.com/r/miniSNESmods/comments/8dbqv7/guide_playing_amiga_games_on_the_snes_classic/