I created portal and columns seemed to be invisible. They were not invisible but too small to appear. You can resize them in layout mode.
I was following a training series (Basics for FileMaker 14: lesson 11). I created a portal.
I chose columns.
And they were invisible.
Resize a portal object. Use hot key “ctrl + I” to pop up inspector. Lock a portal object from changes. Now, you can select column objects and resize (width) them all in inspector.
(FileMaker Training Series: Basics for FileMaker 14
Section 1: Portal