Currently the merge source pipe preview will only show the merged entity in the source part of the preview. The actual input entities are not shown in the pipe preview, which would be useful and consistent with other pipe types.
One way of solving this, at least visually, could be to have tabs in the source part of the preview - one tab for each source dataset.
Dataset _ids are sometimes quite verbose so using the mandatory aliases as tab names would probably save a lot of UI real estate.
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