How can i disable the "mouse scroll wheel click" to view all windows feature in El Capitan
I suspect El Capitan is interpreting this action on your Logitech LS1 Laser mouse as a double-tap with two fingers.

Assuming this is the case, you can try this:


Go to Apple > System Preferences
Click on the Mouse preference pane
Select the More Gestures tab
Uncheck the Mission Control box