the black color is always CMYK process

[notabene34]

hello, 
An InDesign user for over 20 years, I have now been working with affinity publisher for over 2 years. But I still have some big problems on color management with this software. indeed, after having done more than 80 pages for a catalog, I have just noticed that the black that I had selected (in the palette of grays) is in fact a four-color black. Fortunately I had made style sheets and I thought that changing the color to 100% black in the style sheet would correct all my texts. However, it is not. I always have a process black in the color palette when I select a text with the corrected style sheet, whereas in this one the black is 100% without CMY components (see the screenshot). Can someone explain to me what is happening?

[M1000]

Interesting. Could you maybe provide a sample document with just one sample Text Frame?

[notabene34]

Hello,
it's weird, I did the same thing again, namely creating a 100% black color sample and modified my style sheets accordingly and this time it seems to work... I saved my file and I open them again

[tudor]

2 hours ago, notabene34 said:

the black that I had selected (in the palette of grays) is in fact a four-color black

That Grayscale palette is not CMYK, but HSL. Do not use it for print if you want pure K blacks.