Create union between polygon

1.

In start page, click collection name to enter Data collection

2.

Inside Data Collection tab, select Maps tab

3.

Click button

4.

Click button

5.

Select two object you want to union

6.

Click button

7.

You will be directed to page merge properties and you can preview properties from two object that you want to union

8.

Click button

9.

Your 2 polygon now become 1 object

10.

Click button to finish action