Tab Container can be placed onto the form, then have other questions inserted into it so that those questions can be entered multiple times on the same form as a group.
If users needed to input multiple Line Items or list out activities or actions, a Tab Container would be the best way to present and store the data.
Tab Expression is the name that appears on each new Tab.
You can also use Question Reference in this place, so @sa would pull the answer with Reference @sa.
The title is the bolded title that will appear above the Tab Container.
Title Color will change the color of the Tab Container Title.
Title Weight allows you to change the Title from bold to very bold.
Title Alignment allows you to change the position of the Title.
Title Size allows you to change the size of the font used in the Title.