Solution: hide the spurious section divider

[JonSilver]

I didn't find a solution to hiding that spurious top section divider, so I experimented with card-mod until I found out how to do it, and I thought I'd post the solution here just in case it helps someone.

Seems simple, but apparently can take ages to work it out.

    card:
      type: custom:fold-entity-row
      head:
        type: section
        label: Section Without Divider
        card_mod:
          style: |
            .divider {
              display: none;
            }

Yes, it's really nothing to do with fold-entity-row, it's more to do with how the HA section css works. But it's been asked here, because evidently it becomes more of an issue when using an entities section as a folding header.

@thomasloven I hope you don't mind me leaving this here.

[thomasloven]

There's nothing spurious about it.
It's just how the section entity row looks: https://www.home-assistant.io/dashboards/entities/#section

If you don't want a section, don't use a section.
Try for example divider instead, which can be styled natively.