Admin Panel Channels - Sorunome/OmnomIRC GitHub Wiki
This is where you configure which channels exist and to which network they belong.
You can add a new channel with the button, it will be added by default to all your networks. As long as you edit the channel name without entering the advanced settings it'll be automatically changed for all networks added.
In the advanced settings you can manually add/remove networks and make the channel have different names across networks. It is recommended that channel names always start with a #
If you decide that you do not want to use a channel later on, you just disable it, NEVER modify the JSON manually to remove it, that would destroy logging and cause weird bugs.
OmnomIRC networks have, in the advanced settings, an order option, and that is the index by which the channels will be, individually for each network, sorted, starting with the smallest number.
OmnomIRC networks also have a hidden option which will only make that channel appear if you enable the hidden channels in the options menu.