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On the Lemmy settings page, there is a Languages option with a warning that says:
Warning: If you deselect Undetermined, you will not see most content.
However, as you can see from the picture, I do not have any option besides English: 
Is there a way to add Languages to this list? Am I missing most content, like the warning suggests?
I might be wrong but that might reflect the supported languages that your instance is configured for. Meaning, waveform.social might be configured only for English and that could be why your language list is limited.
EDIT: Yup just confirmed on my instance. You should ask an admin at waveform to include Undetermined under the supported site languages.. or make an account elsewhere ๐ฌ
Thanks! I've just asked, so here's hoping.
If you clear the language option, what do you then see? As in, the X to the right of that box?
On desktop you can hold ctrl to then select multiple languages
I can't clear it; the button does nothing.