Printing a colour doc in B&W

In the past when I went to print a Libre Office document which included a colour image of an ID card, I could choose File>Print>Properties>Device>Print Colour Mode>and change from Colour to Monochrome. The print would then be in B&W.

Doing the above, it now it still prints in colour. I can't get in to print in B&W. I’ve tried restarting the printer, to no effect.

I also have another colour document, for which I changed to the print options to B&W, and saved. It used to print B&W, no problem, but that now has the same issue.

I don’t know if it’s a LO or a Mint issue?

Details
Printer Brother DCP-T520W
Libre Office 24.2.7.2
Mint Cinnamon 22.3