Themes Cannot load

I have 45000+ rows code , system themes cannot read , always dark background and white code , see on the attached pictures , anyone please be advice, many thanks

As far as I know, that’s the default behaviour for excessively large files due to performance reasons

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i know but have to do, btw you mean its not have solutions to fixes it !, am i correct?

I’m not aware of any settings, documented or undocumented, that change this behaviour. Keep in mind, that changing this behaviour would result in extremely long parsing times. Atom would likely freeze all the time.