I recently switched from ubuntu to Manjaro. On ubuntu I used Tilix and made it my default terminal emulator.
I did so with:
sudo update-alternatives --config x-terminal-emulator
Is there a way to set the default terminal emulator with Manjaro/Arch?
Edit: I'm using Manjaro Gnome
I currently use manjaro (i3), and in the past have used manjaro preloaded with different desktop environments(gnome, xfce and KDE). One thing that I have observed is that the default terminal emulator depends on the preloaded desktop environment. Unfortunately, you have not provided which DE you use.
For gnome, you can execute:
gsettings set org.gnome.desktop.default-applications.terminal exec gnome-terminal
Make sure to replace gnome-terminal with your choice.
If you use xfce DE, then go to settings, then preferred application, then utilities tab and then change the terminal emulator from there.
If you use i3, you can either change the i3 config file located in ~/.i3/ and then change the binding for $mod+Return exec i3-sensible-terminal (Replace i3-sensible-terminal with your choice.) OR you can install xfce4-settings-manager using:
sudo pacman -S xfce4-settings
Then execute xfce4-settings-manager using menu ($mod+d) follow the steps as I mentioned for xfce desktop environment above.