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Please confirm what you are wanting to do.  Filter the table shown in the screenshot for the max n values in the first column? Filter each grouped table for the max n values in a column named concludedAt (Can you include a screenshot of one of these tables? Is concludedAt a date column, datetime, etc).  Are you wanting to do something else?  

This is how you can filter each grouped tables for the max N rows in the concludedAt column. 

BEFORE

AFTER

SCRIPT

let
    SampleForGroupedTables = Table.TransformColumnTypes(Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlTSUTLRNzLVNzIwMlIwNLIyMCjIVYrViVYyQpVBSBijSCDpMEGRMEZImKJImEAlYgE=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t, concludedAt = _t]),{{"Column1", Int64.Type}, {"concludedAt", type datetime}}),
    Source = #table(
        { "Date", "Data" },
        {
            { 461894, SampleForGroupedTables },
            { 463207, SampleForGroupedTables },
            { 463205, SampleForGroupedTables }        
        }
    ),
    FilterSubtables = Table.TransformColumns ( 
        Source,
        {
            "Data",
            (t) => Table.MaxN ( t, "concludedAt", 2 )
        }
    )
in
    FilterSubtables