...
The Function icons have small arrows which indicate data flow direction, and therefore the function Function type. Collectors have an arrow on the right edge, pointing outwards. Processors have arrows on both edges indicating an incoming and outgoing flow. Forwarders have an arrow on the left edge, pointing inwards.
...
After configuring any Function in , clicking Preview enables you to view input and output preview data for that Function. Across all functions Functions in , the input and output preview data displayed depends on the Function type. Refer to the table below for more information:
...
When you hover the cursor over the function Function icon upon opening the configuration, you can view the tooltip with a brief description of the Function. Clicking 
directs you to the relevant documentation for the Function.
...