An empty row to separate blocks in the channel list
How to leave a gap between blocks of channels, in both inputs and outputs.
If you need a gap between blocks of channels, an empty channel does the job.
- In the channel list, add a channel with the + button where you want the gap.
- Leave its number and its name empty.

In the PDF and in the shared link that channel prints as a blank row, so the blocks on either side read as separate groups. It works the same in the inputs and in the outputs. If you use custom columns, leave those empty too.