I use to could print multiple copies until this last Libre update. I found the collate button greyed out and could only get it to not be greyed out by first checking Print in Reverse Order, then I could click to uncheck greyed out. This is getting difficult to use Libre with having to key this just to print.
LibreOffice 7.1.2.2 (x64) Build 8a45595d069ef5570103caea1…
Windows 10.0 Build 19042