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Modded solution is to get Windows and Dub's Skylights together to allow you to build windows to fulfill outdoors need and have skylight ceilings for the same result.
If you're capable of keeping your people happy with other means, then simply ignoring the debuff is possible.
Otherwise, as mentioned by the others, having unroofed transit zones and outdoor areas for congregating helps. A megabase doesn't necessarily mean a totally enclosed base with ceilings everywhere.
If you aren't under a mountain though and don't need to heavily climate control, you can just unroof your main dining/rec room. Roofs only matter for maintaining temperature and protecting items on the floor from deteriorating, and to a lesser extent protecting from like lightning and rain (obviously toxic fallout). As far as colonist thoughts and room stats go though, no room needs a roof, not even bedrooms last I checked.
That said, the -9 mood debuff isn't a big deal. You can counter it by just having high beauty in rooms. Gorgeous rooms give something like a +10 mood buff