If I read your question correctly, here's my work around:
For each line, I first put in a "Formatted Text" item, and make it as short as possible. I do this for multiple lines.
What this does is basically allows you to modify the size of every other item in that row, and it will not be "linked" to the other items in the rows below.
I know it frustrated me for a long time when I would try adjusting a box, and multiple rows would also start moving at the same time. I would scream NOOOO!!! But my solutions seems to work pretty good.