Sometimes you have to use a line but colored transparent or match the background.
Sent from miPhone
unfortunately, no matter what I do to the frame (invisible setting, white, ... WHATEVER)... it still shows up in Browse Mode and Preview Mode with a pale grey line around the whole portal, and between lines.
I Got it !
I was changing only my selected Portal "box".
In the menu, at right, you need to select "Portal ROW" from the drop-down menu.
If i change THAT to "white line", then it all disappears.....