Hey there,
I think what you will want to do is use a listview instead:
Create a listview with a layout grid with 3 collumns in which you place the information. Make the 3 columns a fixed width.
In the first column you place the dropdown and all information that follows is either shown or hidden based on conditional visibility.
Above the listview you can use a similar layout grid to show the collumn headers. I have provided an example below