I hardly think there is such setting in Dell or non Dell product. Most modern Laptops use Windows precision drivers and Manufactures no longer control the Touchpad.  This is an old model and still uses dell drivers released 2 or more years ago,. If look at product support page there are in total 3 touchpad drivers/app listed, I would suggest try all of them and see any one has such an option, also try increasing sensitivity as well.  [URL]  
I recently purchased a 'renewed' Dell Latitude 5580 from Amazon. Everything works great, except for some unusual behavior when I try to zoom on a webpage (Chrome, Edge, Firefox) using pinch/zoom. The expected behavior (as it does on my Latitude 5500 and my HP) is to zoom in, or magnify, the web page.  But on this laptop, when I pinch/zoom, it just increases/decreases the zoom level in 10% increments, as if I'm pressing CTRL and +/-.   I've tried removing, reinstalling the latest touchpad and display drivers.  All other drivers a up to date. Is this behavior configurable, of is it a limitation/function of the hardware?   Thanks for any help, Mike
Touchpad pinch zoom behavior