How to change my keyboard shortcut Alt+scrolling mouse wheel to just scrolling the mouse wheel?

Hi, Im more familiar with Sony Vegas and if anyone is familiar with the way the timeline works on that program, you just need to scroll in order to zoom in on your timeline to a specific area of your project. After Effects make you hold alt and scroll to do this. Is there a way I can remove the need to use Alt, and to just change it so I just scroll to do the same thing? Ive tried looking in keyboard shortcuts but I cant seem to find anything that controls the mouse section. 

If anyone generally also has any tips/tricks or videos they could link me to imitating sony vegas' style of editing but in After Effects to ease the transition Im doing from sony vegas to after effects Id appreciate it 🙂 Thankyou!