If I'm understanding, then adding the two marked lines <<<<<<<<<<<<<<<<<<< will re-hide the spin button after clicking
Private Sub SpinButton1_SpinDown()
Application.EnableEvents = False 'disable "Worksheet_Change"
[C6] = resultado + SpinButton1.Value / 100
[C5] = [Round(C1 * C3 * F1 / (C2 * F2 * (C6 + C3)),2)]
MonBoSpin '<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Application.EnableEvents = True 'activate "Worksheet_Change"
End Sub
'
Private Sub SpinButton1_SpinUp()
Application.EnableEvents = False 'disable "Worksheet_Change"
[C6] = resultado + SpinButton1.Value / 100
[C5] = [Round(C1 * C3 * F1 / (C2 * F2 * (C6 + C3)),2)]
MonBoSpin '<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Application.EnableEvents = True 'activate "Worksheet_Change"
End Sub