Trainz

Hi Everyone!! I am currently working on my Seaview Railroad in TRS 2019. I have added one Baseboard OK. I am trying to put another one in but when I got to Topology and click on Advanced button I don't get Add a Baseboard. Could someone help me I have tried everything I know. I have tried several times, Add Baseboard doesn't appear, just a gray box with a red box in the center of the gray box. Any help would be appreciated!!

Bruce