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Thanks everybody for the tips and links, but I didn't have probs getting to display settings, it just wouldn't let me get into the part where I want to change the fonts in menu/address bars.
On Win8, it was simple, so why, when they think they are improving or making things easier for people, do they make it more complicated, and time consuming, with computer jargon, I have no idea what it means.
To give you an example: it would be like me, trying to teach people on-line, how to guide giant oil tankers, using Navigation Aids, through the Arabian Gulf, which was a past profession of mine for 11 years!
I reckon I have spent more hours trying to understand Win10, than I have spent using my laptop for pleasure, and seriously thinking of going back to Win8, which will probably mean, I have to study for another Diploma, to get back to normality :-)