In this video explains everything you should know about flatpak theming.
As others said, you probably haven't installed the chosen theme yet.
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Have you installed xdg-desktop-portal-gtk?
xdg-desktop-portal-gtk?
Yes, it's already installed.
Is it being forced to look for a theme installed via flatpak maybe?
How do I know that exactly?
Apparently there has been a problem with gtk4 apps and theming in flatpak, only supporting adwaita light and dark - only found vague reference to it though, nothing concrete.
Try
flatpak-metadata sockets
To see if you can find the GTK_THEME environment variable.
You’ve given it permission to access the themes folder, now you need go point it at the themes
sudo flatpak override --env=GTK_THEME=my-theme
sudo flatpak override --env=ICON_THEME=my-icon-theme
Where my-theme is the theme name, e.g. Adwaita-dark
Apparently the flatseal gui has some functionality to set the theme too! Will check it out tomorrow to see what’s up.
here's the same as text
sudo apt install xdg-desktop-portal-gtk
systemctl --user edit xdg-desktop-portal.service
- paste these two lines
[Service]
Environment="XDG_CURRENT_DESKTOP=sway"
systemctl --user restart xdg-desktop-portal.service
This also refused to work unfortunately.