Private Sub UserForm_Initialize()
    Dim ctl As Control, ratioW#, ratioH#, wstate&
    With Application: wstate = .WindowState: .WindowState = xlMaximized:
        ratioW = Application.Width / Me.Width
        ratioH = Application.Height / Me.Height
        .WindowState = wstate
    End With
    With Me
        .StartUpPosition = 0: .Left = 0: .Top = 0
        .Width = (.Width * ratioW) - (.Width - .InsideWidth)
        .Height = (.Height * ratioH) - (.Height - .InsideHeight) + (.Width - .InsideWidth)
    End With
    For Each ctl In Me.Controls
        ctl.Move ctl.Left * ratioW, ctl.Top * ratioH, ctl.Width * ratioW, ctl.Height * ratioH
        Select Case TypeName(ctl)
        Case "TextBox", "Label", "Frame", "CommandButton", "MultiPage", "ListBox", "ComboBox", "CheckBox", "OptionButton"
            ctl.Font.Size = ctl.Font.Size * ratioH
        End Select
    Next
End Sub