Slice rows not supported with its customized format

Hello, Ravi,
 
Thank you for writing to us.
 
We have modified the JSFiddle example so that the left text alignment is applied for both views(flat/compact):
 
We changed this:

{
"name": "",
...
"textAlign": "right"
}

to this:

{
"name": "",
...
"textAlign": "left"
}

 
Please let us know if this works for your case.
 
We are looking forward to hearing from you.
 
Best Regards,
Vera

Hello, Ravi,
 
Thank you for your reply and for providing more details.
 
It helped us a lot to understand your case better.
 
We would like to point out that formatting can be applied only to measures.  
In your case, the specified format is not applied because Column is defined in rows, not in measures and this is why the output for flat and compact/classic forms is different: in compact/classic form by default fields specified in rows are aligned left, whereas in the flat form they are aligned to the right.
 
For this reason, as a workaround, we kindly suggest specifying the fields you would like to apply the dimensionDefaultFormat to in measures as well, for example:

measures: [

    {
       "uniqueName": "Column",
       "aggregation": "sum",
       "grandTotalCaption": "Column",
       "active": false,
       "format": "dimensionDefaultFormat"
    }

]

By setting the active property to false, the Column won't be displayed in measures, but the format will be applied, hence, the desired output will be achieved.
 
Here is a JSFiddle example for illustration.
 
Please let us know if this approach works for you.
 
Best Regards,
Vera