My main issue with the site is that in my browser i get the mobile version instead of the desktop since i do not use my browser maximized (i have a 1366x768 mon

My main issue with the site is that in my browser i get the mobile version instead of the desktop since i do not use my browser maximized (i have a 1366x768 monitor). Isn't there any other way to figure out if i use a mobile phone instead of using the horizontal resolution?