The elements, that you can use to build up a design (or template as they are called in InterFormNG2) are described below.
The elements are found on the top of the designer and are marked below with the blue frames:

The bottom row is displayed if you click the '+' icon in the top row.
There are also 2 special elements, that can only be inserted outside the page element. To view these elements you need to click 'Template' in the element list on the left:

These two elements are explained in the bottom of this list.
The elements are from left to right:
Component: Inserts a common component/subtemplate, which is a selection of design elements. Useful for common header/footers.

Image: Inserts an image.

Translation: Refer to translation table e.g. for a multi-language template.

Table: Add a fixed or dynamic table of cells to e.g. organize the output into fixed columns/rows with or without lines.

Text: Add a text element. This can a fixed text, XML data, an Xpath expression or translation text.

Container: A 'folder' to group elements together. Elements inside are positioned relative to the container.

Line: Inserts a line.

Flow direction: Sets the flow direction of a selected page or container. This is used when elements are inserted relatively (default).

Fill color: Fills a selected container, table or cell in a table with a color.

Borders: Add borders to a selected container, table or cell.

Barcode: Insert a barcode.

Page Break: Inserts a page break.

Line break: Inserts a line break. This is only available for containers with a horizontal flow (row).

Comment: Adds a comment to the design. Not visible in the merged result.

Embed a file: (Require the AdvancedPDF module). Adds an embedded file to the merged PDF result.

RFID tag: Inserts an RFID tag on RFID capable ZPL compatible printers.

Form field: Inserts a input field in the output PDF file.

Bookmark: Inserts a bookmark in the output PDF file.

Chart: Inserts a chart in the output.

Repeat: Repeats the elements inside this folder a number of times.

If element: Inserts/executes the folder if a boolean expression (condition) is true.

Select element: Similar to the If element. Branches out with multiple conditions and an Otherwise branch.

Variable: Defines and set a value for a variable.

Page element: Inserts an extra page element in the merged result.

Template properties: The general properties of the template.

Workflow variable: Defines and set a value for a workflow variable.
