Go to the lesson editor, on the left side click “Regenerate lesson” replace the text, make sure it actually saves the changes by clicking outside the text editor. Caveat, this can reset the character splitting and the timestamps.
The print lesson function is not a good option because it introduces whitespaces between characters that can confuse character converters / translation software etc. as Chinese is not written with whitespaces outside of LingQ.
Personally I have not found the “prompt” feature to be useful, for me Whisper will happily flip-flop between character sets in the middle of a transcript. This really needs a post-processing step, as for software I recommend: GitHub - BYVoid/OpenCC: Conversion between Traditional and Simplified Chinese which works perfectly in my experience (both directions) and has many language bindings. It would be unrealistic to expect LingQ to implement such an advanced technological solution for a fringe language but Rooster got this: Web Browser Extensions (Software) for LingQ - #200 by roosterburton
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