Some apps don’t apply the same theme, it’s not pleasant. open for exemple transmission, it use old adwaita theme.
The solution is to use the adw-gtk3 theme, with some tricks given that eos6 uses gnome 43 and that certain flatpak applications use 44 45 46 47…
setup is easy, open the terminal and paste this:
flatpak install -y org.gtk.Gtk3theme.adw-gtk3 org.gtk.Gtk3theme.adw-gtk3-dark
mkdir ~/.themes/
cd ~/.themes/
wget https://github.com/lassekongo83/adw-gtk3/releases/download/v4.9/adw-gtk3v4-9.tar.xz
tar -xf adw-gtk3v4-9.tar.xz
mv adw-gtk3 adw-gtk3v4.9
mv adw-gtk3-dark adw-gtk3v4.9-dark
wget https://github.com/lassekongo83/adw-gtk3/releases/download/v1.3/adw-gtk3v1-3.tar.xz
tar -xf adw-gtk3v1-3.tar.xz
rm *.xz
gsettings set org.gnome.desktop.interface gtk-theme ‘adw-gtk3’ && gsettings set org.gnome.desktop.interface color-scheme ‘default’
sudo flatpak override --filesystem=/sysroot/home/$USER/.themes/
sudo flatpak override --env=GTK_THEME=adw-gtk3v4.9
this video show the result
https://drive.google.com/file/d/1oQSCcGNY66TxX5mvmQJInejOLejymKoK/view?usp=sharing
reason of using 2 themes is than with V1.3 ( last version for gnome 43) somes apps show transparent window) with V4.9 Evolution has somes buttons not working…