2 Fixed pictures
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I think that the answer is "it depends" and can be domain-specific. For example, if you have only a few and a fixed number of top level groups, you can use a design like this:

enter image description hereenter image description here

The top-level groups can also be arrange horizontally.

If you have more than just 3-4 but still in the range of a dozen or two, you can use something like this:

enter image description hereenter image description here

I think that the answer is "it depends" and can be domain-specific. For example, if you have only a few and a fixed number of top level groups, you can use a design like this:

enter image description here

The top-level groups can also be arrange horizontally.

If you have more than just 3-4 but still in the range of a dozen or two, you can use something like this:

enter image description here

I think that the answer is "it depends" and can be domain-specific. For example, if you have only a few and a fixed number of top level groups, you can use a design like this:

enter image description here

The top-level groups can also be arrange horizontally.

If you have more than just 3-4 but still in the range of a dozen or two, you can use something like this:

enter image description here

1
source | link

I think that the answer is "it depends" and can be domain-specific. For example, if you have only a few and a fixed number of top level groups, you can use a design like this:

enter image description here

The top-level groups can also be arrange horizontally.

If you have more than just 3-4 but still in the range of a dozen or two, you can use something like this:

enter image description here