Tech question

Hey guys I pulling my fu*king hair out. I played DH2018 a while back. I play on my laptop. When I played before Im positive that right click on the mouse would bring my scope up and left click whole be the trigger. Now Its all retarded. I have to drag the scope from the lower left hand of the screen to the center of the playing screen, then theres a pic of a bullet I have to click on in order to fire the weapon. I refuse to play this way, can anyone help me out? Thanks in advance...