1. go to dashboard edit mode.

2. click on the edit icon of the table widget.  

3. In the selected column area, there is a field named 'Pinned Column'.

4. Double click in pinned column area of the required column, in the text box write 'left' or 'right' and hit enter.

5. Click on the preview button, the required column is pinned to the given alignment.

6. you can pin multiple columns to the left or right side of the table.