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You can use the element declaration list’s filter on the left side of the window to find the element with the name “ProfitLoss”. By double clicking on it, all occurrences of this item are highlighted in the window in the center. You can change the item’s weight attribute by double clicking in the cell in the weight column.
See
also: http://www.xbrl.org/Specification/XBRL-2.1/REC-2003-12-31/XBRL-2.1-REC-2003-12-31+corrected-errata-2013-02-20.html#Constraints-among-the-balance-attribute-and-calculation-arc-weightsFor further information see the XBRL specification.