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For ssh connections this procedure is not required, as X-forwarding for ssh is enabled by default in /etc/ssh_config, so you don't even have to add a "-X" command-line parameter

For any other cases, authorise incoming X connections to your workstation first:
$ xhost +
Then, find out your display port:
$ env | grep DISPLAY
For instance, an output of DISPLAY=":100" means that your display port is 100 (which is the default)

And, finally, in the remote machine, indicate your display port:

$ export DISPLAY=<vm-name>.ecmwf.int:<display_port>

For example

$ export DISPLAY=c8-beta-001.ecmwf.int:100
$ run_my_gui_application

After you have finished, always remember to disable incoming connections again:
$ xhost -