I have selected keyboard layouts:
How can I setup
en
as startup keyboard layout for now it is th
.
mkdir -p ~/.config/autostart
tee ~/.config/autostart/kb-layout.desktop << "EOF" > /dev/null
[Desktop Entry]
Name=kb-layout
Exec=gsettings set org.gnome.desktop.input-sources mru-sources "[('xkb', 'us'), ('xkb', 'th+tis')]"
Type=Application
EOF
At startup you mean before or after login?
While logged in follow his instructions, then the next time you log in it will take effect.