I have a photocard which is 4x5.9 but it has rounded corner instead of square. I don't see template with corners like this. How do I get one or make one?
Your help is appreciated.
Your image in Lightroom will be rectangular (with square corners)
If you want to print borderless on the paper with rounded corners you may have to use a backing sheet and design the Lightroom layout to suit. Eg. with margins set to print a 4x6 image on the A4 backing sheet.
See this pdf to describe-
Your template in Lightroom will be A4 paper with cell size of 4x6in.