How to prevent the warning message
It pop up the message "you have modified citation sicne zotero generated it"。 I want to click no. But I have hundreds of footnotes, how can I click hundreds times of No. Why is there no option for no for all the warning message?
I believe that changing to another style will force an update of all word-processor-edited citations, without warning, after which you can switch back to the original style. Note, though, that you will lose all of your manual changes.
If you have made hundreds of citation changes through the word processor, you will need to do manual work to unfreeze the citations, because Zotero can't safely handle those automatically.
If you are close to completion, and the steps above are unnecessarily cumbersome, you can unlink citations (again, in a copy of the document), and proceed with your final edits in the word processor as you have been doing.
This was in Libreoffice 6.3.3 with Zotero 5.0.77.
Maybe I did something wrong to the document, but if this is unexpected behaviour I saved the faulty document in case I can do some debugging to help with this issue.