Dont.

I curse the day ive chosen 13” xps with 3200x1800 hdpi screen. Id trade it for fullhd in a blink.

Three issues:

1. It is goddamn mirror, and mind you im not picky here

2. Hundreds of apps or system parts (regedit? Wtf?) are complettly messed up by hdpi and scaling leaves you either too small or problems. Keybase desktop client (search for my bug) shows what you can expect. Windows 10 can not handle it. Gnome works more/less.

3. You dont need it on 13” screen. FHD is enough.

Oh, and you cant disable touchscreen without serious jujitsu (bios option is ignored by windows)

Simply dont. Take fullhd.