[Lens] Disabled nested switch if horizontal legend alignment is selected

[Heenawter]

Kibana version: 8.7

Describe the bug:
When the Nested legend setting is true and the legend location is on the top or the bottom of the chart, the hierarchy of the labels is lost because the indentation is not consistent with when the legend is on the left or right of the chart.

Steps to reproduce:

1. Create a nested donut chart
2. Display the legend on the left or right of the chart
3. Switch Nested to true - notice how the hierarchy of the labels is made clear.
4. Change the location of the legend to the top or bottom of the chart - notice how the concept of hierarchy is lost 🔥

Expected behavior:
The inner labels should be indented to make the hierarchy of the labels clear, regardless of the legend position.

Video:

Screen.Recording.2023-02-14.at.11.10.17.AM.mov

[elasticmachine]

Pinging @elastic/kibana-visualizations @elastic/kibana-visualizations-external (Team:Visualizations)

[stratoula]

I am not sure about it. @markov00 is this intended?

[markov00]

Yes, it works as intented.
The problem is that a default horizontal legend configuration renders only 2 rows. Rendering the indentations in such a constraint is very confusing.

If you render more than two rows, like in the shared video it could work, but still, it will be far from ideal.
It needs definitely a redesign but not the way it works today (a clear hierarchical representation, collapsable hierarchical level etc).

I think what we could at Lens level is to disable the nested option for horizontal legends.

[stratoula]

Agreed, I am changing this to enhancement

[stratoula]

Thank you for contributing to this issue, however, we are closing this issue due to inactivity as part of a backlog grooming effort. If you believe this feature/bug should still be considered, please reopen with a comment.