Fortnite: After buying a new mouse, scrolling through the guns?

Since I have my new mouse (Razer Basilisk), switching weapons has been inaccurate at Fortnite. With the old mouse I was able to switch weapons using the scroll wheel and one slot forward or back was changed for each "click" of the scroll wheel. Now it sometimes changes only after two, sometimes quite normally and sometimes twice or delayed. Can you adjust the sensitivity in the Razer driver or something?

You also don't scroll! But has buttons to change weapons

Either the driver or in Fortnite

You use keys to change weapons

And with which ones? Tab, Q?

Okay, you can also do it. But that was not my question.

Ar = L-Alt, Pump = Q, Mp = R, Sniper = 3, Schild = X