Created attachment 111210 [details] Screenshot of advanced options in Firefox This is a new problem in KDE-5 concurrent with upgrade to Fedora 27 in 2018. Advanced options including printing in colour are not available in Okular, but are available in Firefox
Created attachment 111211 [details] Screenshot of advanced properties in Okular Access to colour printing not an available option,
Created attachment 111212 [details] Screenshot of advanced properties in Okular no access to colour printing this was available in Fedora 25
That is a Qt bug that was recently resolved, see https://code.qt.io/cgit/qt/qtbase.git/commit/?id=b4330bc391bbb08898f192ea3469b73aed09134c