Use
The node type Complex section is absolutely sophisticated. It allows you to combine the tab pages of the node types
Folder, Template, Table and Loop in any way.
If you can create the desired output by using one of these node types alone, then do it. In this case, the icon in the tree structure immediately indicates the type of output created with the node.
Procedure

If, due to changing the selection, tab pages would disappear, the Smart Builder offers a warning beforehand.
Result
You can now use the selected tab pages.