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Install sway via:

$ sudo pacman -S sway alacritty

Logout and type sway in terminal, here we encounter Nvidia issue:

$ sway
sway/main.c:100Proprietary Nvidia driver are NOT supported. Use Nouveau. To launch ....
$ sway --my-next-gpu-wont-be-nvidia
Could not connect to socket /run/seated.sock: No such file or directory
$ echo LIBSEAT_BACKEND=logind >> /etc/environment 
$ sway --my-next-gpu-wont-be-nvidia 2>&1 | tee start.log
sway/main.c: 202 unable to drop root
$ sudo useradd -m dash1
$ sudo passwd dash1
$ exit
Login with the newly created dash1 and re-test

Install gdm and change to opensource nvidia driver:

$ sudo pacman -S gdm
$ sudo rm -f /etc/modprobe.d/nouveau_blacklist.conf
$ sudo vim /etc/mkinitcpio.conf
MODULES=(... nouveau ...)

$ sudo  mkinitcpio -p linux