Remove Row Total Paginated Report

In the __DS0Core variable you can see the calls to ROLLUPGROUP and ROLLUPISSUBTOTAL functions which are generating this extra total row.

Obviously without your data model I cannot test the query below, but I think I've removed those two functions correctly.

// DAX Query
DEFINE
    VAR __DS0FilterTable =
        TREATAS ( { "Hours" }, 't_PP11'[UOM] )
    VAR __DS0FilterTable2 =
        FILTER (
            KEEPFILTERS ( VALUES ( 'Date'[weekending] ) ),
            AND (
                'Date'[weekending] >= DATE ( 2021, 5, 14 ),
                'Date'[weekending] < DATE ( 2021, 5, 21 )
            )
        )
    VAR __DS0Core =
        SUMMARIZECOLUMNS (
            't_PP11'[Employee or Supplier],
            't_class'[Adjusted Exp. Cat. Name],
            't_Project'[Project Engineer],
            't_PP11'[Booking Code],
            't_Project'[Job Code],
            't_Project'[Job Description],
            'Date'[weekending],
            __DS0FilterTable,
            __DS0FilterTable2,
            "SumActual_MH", CALCULATE ( SUM ( 't_PP11'[Actual MH] ) )
        )
    VAR __DS0PrimaryWindowed =
        TOPN (
            502,
            __DS0Core,
            [IsGrandTotalRowTotal], 0,
            't_Project'[ Project Engineer], 0,
            't_PP11'[Employee or Supplier], 1,
            't_class'[Adjusted Exp. Cat. Name], 1,
            't_PP11'[Booking Code], 1,
            't_Project'[Job Code], 1,
            't_Project'[Job Description], 1,
            'Date'[weekending], 1
        )
EVALUATE
__DS0PrimaryWindowed
ORDER BY
    [IsGrandTotalRowTotal] DESC,
    't_Project'[ Project Engineer] DESC,
    't_PP11'[Employee or Supplier],
    't_class'[Adjusted Exp. Cat. Name],
    't_PP11'[Booking Code],
    't_Project'[Job Code],
    't_Project'[Job Description],
    'Date'[weekending]