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I've used Affinity publisher to design a book that I want to send to be professionally printed. The colour space of the document is in grayscale, I made the text 0 gray on the grayscale, exported it to pdf explicitly in grayscale (D50), and still the text in the pdf seems to be build up in CYMK colours. How is this possible? How can I export to a purely black and white pdf, ready to be printed in black and white, instead of in colour?

Preface: I'm working simultaneously on different screendesign- and printdesign documents (RGB vs. CMYK) side-by-side. Ergo: I have the padlock "colourspace lock" deactivated so I don't have to remember to manually switch every time I click into the other document when I do stuff with the colour panel. I also can copy a coloured object from the CMYK doc to the RGB doc and it retains its original colour values. I can inspect this in the colour panel: click on RGB object -> RGB sliders, click on CMYK object -> CMYK sliders. (CHECK) This works fine until I have a CMYK global colour: the object is copied over correctly from the CMYK to the RGB doc, but when clicking on <EDIT GLOBAL COLOUR> it displays the popup with whatever sliders were selected before, as if It had checked the lock internally with no way to disable that, because there is no UI for it. Thats an easy trap for unwanted colour changes. I want to be able to inspect which colourspace a particular swatch (global) was created in. And: Yes I know that RGB colours will look different when used in a CMYK doc. I just want it to retain its original creation values (for later use in a CMYK doc.) Please fix this, maybe by adding this lock also to the popup. (and please make the ON/OFF state more visible.) Bildschirmvideo aufnehmen 2021-05-21.mp4