Return All Data From Left Table
If you add a filter on the right table, you effectively turn your outer join into an inner join.

Move the date filter from WHERE to ON.

Also I suggest an open-ended range rather than BETWEEN.


What do BETWEEN and the devil have in common?


Finally, I suggest not naming your CTE the same name as the base table (this is confusing), using proper schema references, and end with a semi-colon.


Bad habits : avoiding the schema prefix
Ladies and Gentlemen, Start Your Semi-Colons


Here's a start:

;With ec As
(
    Select
      StoreName
      ,DataFromOne = Count(ramalad)
    FROM dbo.DataFromOne
    WHERE EntryDate &gt;= '20170101' 
       AND EntryDate &lt; '20170401'
   GROUP BY StoreName
)
Select 
  ec.StoreName
  ,[Emp Count] = COUNT(fji.Employee)
  ,[PT Count] =      COALESCE(ec.DataFromOne,0)
FROM ec
LEFT OUTER JOIN dbo.DataFromTwo AS fji
   ON ec.StoreName = fji.StoreName
   AND fji.SaleDate &gt;= '20170101'
   AND fji.SaleDate &lt;  '20170401'
GROUP BY ec.StoreName, ec.DataFromOne
ORDER BY ec.StoreName;


In fact, you can simplify the query logic quite a bit (though I am not sure exactly how that will change your plan):

SELECT 
  ec.StoreName,
  [Emp Count] = COUNT(fji.Employee),
  [PT Count]  = COUNT(ec.ramalad)
FROM dbo.DataFromOne AS ec
LEFT OUTER JOIN dbo.DataFromTwo AS fji
   ON ec.StoreName = fji.StoreName
   AND fji.SaleDate &gt;= '20170101'
   AND fji.SaleDate &lt;  '20170401'
WHERE ec.EntryDate &gt;=  '20170101' 
  AND ec.EntryDate &lt;   '20170401'
GROUP BY ec.StoreName
ORDER BY ec.StoreName;