You are able to print 3x5 or 4x6 size groom cards. You can also print 1, 2, or 3 per page. If Kennel Connection is only printing 1 per page, make sure you have the option set properly.
Click on File, System Options, Grooming tab.
Enter your preference for 1, 2, or 3 per page.
Next, click on the Groom Card Format tab.
If you are choosing to include too much information, it can force KC to print only one card per page.
Adjust your settings here, including decreasing the number of visits for History or disabling other options.
You'll need to test your settings until you find the right combination that will allow KC to print 2 or 3 card per page.