Thank you both for your replies. Sweetpeasue, I followed your advise and removed the tick, no joy! Been to phone shop and the young man was very polite but couldn't solve the problem. My ' children ' and their spouses are my next port of call. In the meantime I can zoom in . Thankyou both again .
This has happened to me on my phone. In my case I'd accidentally hit the 3 vertical dots on the top right hand corner and it converted to desk top layout (teeny print). Tap it again and there was a square box next to desk top . Tap the box to remove the tick and it should rectify the print problem.