I have sent this bug to https://bugs.documentfoundation.org/ since yesterday but i have not gotten response yet. Just wondering if anyone here had the same problem and solved it.
I can not uncheck collate option in print dialog in libre office, collate option is greyed out. I know it is not printer problem because I can check or uncheck collate when printing in other app e.g. Okular. Checking other option does not solve the problem. I don’t know since when this problem occured because I rarely need to tinker with collate option, but I can uncheck it before.
A stop gap solution would be to print from Libre Office to a pdf. Then print the pdf to your printer within Okular. Just tried and it works around the glitch of not being able to select collate printing option - which can be controlled within Okular.