Server configuration is found in /etc/ssh/sshd_config
Match User manjaro
X11Forwarding yes
Default :10
X11DisplayOffset 10
X11UseLocalhost no
Client configuration is stored in ~/.ssh/config
ssh -X manjaro@host.name
ssh -o ForwardX11=yes manjaro@host.name
Edit the local config and set
X11Forwarding yes
e.g. xclock (fork to background)
ssh -X -f user@host xclock
For more info read the man page
man ssh
check xauth
$ which xauth
/usr/bin/xauth
It is usually present on Manjaro - if not sync the package
sudo pacman -S xorg-xauth