I am having trouble with the portal I have created. When I create a new portal, there are no lines to delineate the different rows and I can't figure out how to add them. I have tried going into Appearance and checking the "center line" option (just above the corner radius circle), but this option seems to be greyed out for me. Below is a screenshot of my portal setup in layout mode and of the portal in browse mode. I am using Filemaker Pro Advanced 16. Thank you for your help!