dm-p, 

Thank you so much for detailed answer   😊

To be honest, I'm not sure If I have chosen the correct way for achieving separate lists.
Could you tell me if exists any way to avoid duplication around data mapping from different tables.
For now, I have “1 task” and “5 events”,
In the result, we see task “5 times" instead “1 time”.

I would like to have 2 separate lists, if it is possible:
"tasks" - 1 item
"events" - 5 items

I guess reason is in dataViewMappings.

Capabilities.json:

{
  "privileges": [],
  "dataRoles": [
    {
      "displayName": "Tasks and Hierarchy",
      "name": "Tasks",
      "kind": "Grouping"
    },
    {
      "displayName": "Start Date",
      "name": "StartDate",
      "kind": "Measure"
    },
    {
      "displayName": "Dynamic event",
      "name": "DynamicEvent",
      "kind": "Measure"
    },
    {
      "displayName": "Dynamic event label",
      "name": "DynamicEventLabel",
      "kind": "GroupingOrMeasure"
    }
  ],
  "dataViewMappings": [
    {
      "matrix": {
        "rows": {
          "for": {
            "in": "Tasks"
          },
          "dataReductionAlgorithm": {
            "top": {
              "count": 30000
            }
          }
        },
        "values": {
          "select": [
            {
              "for": {
                "in": "StartDate"
              }
            },
            {
              "for": {
                "in": "DynamicEvent"
              }
            },
            {
              "for": {
                "in": "DynamicEventLabel"
              }
            }
          ]
        }
      }
    }
  ],
  "advancedEditModeSupport": 2
}

Thank you in advance 🤗