The preview option is part of the printer options not LR. In the properties dialog box there is a tick box to select show preview.
I'm not sure exactly which tab it is on but I have the same printer among others and it is there.
Thank you for your reply Alfred.
Yes I can see the tick box OK. The problem I have is that despite checking the tick box, I am still not getting the print preview (on a green background) that I used to get.. The printer goes straight into printing as soon as I click on to the "print" button. Maybe it is a printer problem rather than a Lightroom problem. If there were an alternative programme I could try printing from that maybe and see if I dont get a print preview in that either. Not sure what programme to try (I use a PC with windows 10)
Try something like photo viewer or similar I think would be ideal. I don't have windows in front of me to try at the moment sorry Photoshop also might be a good one to try if you have it?
I've tried Corel Aftershot 2 and I don't get a print preview in that either, although I get a little box coming up on screen saying "Canon IJ Preview is in operation.", which isn't true (at least it is not displaying a preview.
It sounds as though it is a canon printer problem. Maybe the printer needs to go away for servicing.
I have tried completely re-installing it, in case some of the code had got corrupted, but it didn't help.
The print preview button you are talking about is a function of the printer driver, and not a function of Lightroom. Perhaps you need to reinstall the printer driver.
Thanks Jim. Yes that was the first option I considered, I down loaded the latest 64 bit printer driver and installed it but it didn't resolve the problem. I have since completely re-installed the printer (Canon Pro 9500 mk2) but I still don't get a print preview, even though a screen saying "Canon IJ print preview is in operation" pops up. Otherwise it seems to be printing OK