Resolved by the support. I was not aware that with newest builds of Windows 10, these settings moved on a page called trackpad settings. Good to know.
Hello, I would like to modify the pressure on the touchpad of my Latitude 5520 to avoid misclicks and mistakes but it seems there is no Dell touchpad drivers like other models. I checked for new drivers on the support page, used DCU and SupportAssist but no drivers. Is there something I'm missing ? Thanks for your help. Regards.  
Latitude 5520 missing touchpad drivers ?