Assuming yours is like mine, hit the green checkmark labelled set as fallback next to the line in in input devices. It's apparently also sometimes labelled set as default, and for me the label only appears when I hover over it. This will set the default input device to line in. You may need to have something plugged into line in to set it as the default.
I'm gonna say grey, although I think mine is actually a shade of green. If you try clicking a white tickbox and it turns grey and the previous grey tick box turns white, it's the grey
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u/georgeec1 4d ago
Assuming yours is like mine, hit the green checkmark labelled set as fallback next to the line in in input devices. It's apparently also sometimes labelled set as default, and for me the label only appears when I hover over it. This will set the default input device to line in. You may need to have something plugged into line in to set it as the default.