Preview:
Sub TrimText()

  Dim c As Range
  Dim AppCalcMode As XlCalculation

  Application.ScreenUpdating = False
  AppCalcMode = Application.Calculation
  Application.Calculation = xlCalculationManual

  For Each c In Selection.Cells
    c.Value2 = Trim(c.Value2)
  Next c
  
  Application.Calculation = AppCalcMode
  Application.ScreenUpdating = True
  
End Sub
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