Sometimes it is very useful to understand the source and destination wires connected to a particular block. Halogen provides a setting which allows you to easily see these connections: Highlight Wires. To enable this feature, click on the drop-down arrow of the Settings menu on the right side of the Ribbon Bar, then select Highlight Wires:
When Highlight Wires is enabled, Halogen displays all wires in blue that are connected to each selected block. This allows you to click on one or more blocks to select them and easily see all wires connected to those blocks. The image below shows wire highlighting for the top-most Compressor block, which is the only block selected.
As you select different blocks in the processing map, Halogen changes the highlighting to match the set of selected blocks.