Icon Themes (And Missing Icons)

Way-Shell bases icons off the main Adwaita icon theme and uses icon names from this.

So far, icon themes from distro/de maintainers have the best compatibility.

It's recommend to change your icon theme to Adwaita: https://gitlab.gnome.org/GNOME/adwaita-icon-theme

The Cosmic Icon theme works very well too: https://github.com/pop-os/cosmic-icons

Feel free to explore other icon themes as well, but understand that not all icon themes implement all icons from Adwaita.

As mentioned by @privat, if you're on a system where Gnome has not already set the default theme to Adwaita you can do this in your sway config with:

exec gsettings set org.gnome.desktop.interface icon-theme Adwaita