So where i am there are 2 signals intern signal and extern (wifi for everybody who works here) and the cms is setup in intern signal can i use a laptop on extern to edit the layouts and display them on the tv’s or do i have to be in the same LAN?
That depends how is it all set up and if you can access the CMS address in the web browser on your laptop and if not if it can be exposed for you to access it.
If the CMS is strictly accessible only on lan then assuming it is not ‘possible’ to expose it outside of lan, then you’d need to access it from the same network.
on the intern i setup cms with xampp, but i will try it a soon as i can and let know if it works or not.