when I add new sources, the lineups are by default all turned on for every channel available. this I understand and agree by default. however, some sources I choose have a large amount of channels available but I do NOT want to watch or view them in my guide. if there was a toggle or column on/off click to (temporarily) choose them all off I would not have to click on 100+ or 600+ channel names to turn them all off that I dont want to view.
maybe just a small column tick box at the top for all on/off selection and then let me run through the ones I do want to choose. currently it is just defaulted to all on at first creation.

instead of the current no option at all
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