I would set the filter, not restrict the recordset.
WGM: Setting the filter would restrict the form to that single record, which is the problem trying to be resolved.
Hagar: See if you can adapt this, which uses the DLookup provided by CJ_London above to get the target starting point.
Code:
'---------------------------------------------------------------------------------------
' Method : Whatever_AfterUpdate
' Author : davegri
' Date : 8/20/2021
' Purpose: All the records in this form's recordsource are available after
' this type of lookup.
'---------------------------------------------------------------------------------------
Private Sub cboSearch_AfterUpdate()
dim LU as date
LU = "LastUpdated=#" & format(dmax("LastUpdated","detail"),"yyyy-mm-dd hh:nn:ss") & "#"
With Me.RecordsetClone
.FindFirst "lastupdated = #" & LU & "#"
If Not .NoMatch Then
If Me.Dirty Then Me.Dirty = False
Me.Bookmark = .Bookmark
End If
End With
End Sub