See your code I changed :
#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>
#include <EditConstants.au3>
Opt("TrayIconHide", 1)
Opt("GUIResizeMode", $GUI_DOCKALL)
Move()
Func Move()
$Form = GUICreate("", 131, 220, -1, -1)
GUISetState()
$go = GUICtrlCreateButton(">", 50, 194, 75, 17, 0, $GUI_DOCKALL)
$go1 = GUICtrlCreateButton("<", 137, 194, 75, 17, 0, $GUI_DOCKALL)
GUICtrlCreateLabel("", 131, 0, 1, 220, $GUI_DOCKALL)
$expanded = False
$expanded1 = True
WinMove($Form, "", Default, Default, 137, 246)
While 1
$nMsg = GUIGetMsg()
Switch $nMsg
Case $GUI_EVENT_CLOSE
Exit
Case $go
If Not $expanded Then
WinMove($Form, "", Default, Default, 262, 246)
EndIf
Case $go1
If $expanded1 Then
WinMove($Form, "", Default, Default, 137, 246)
EndIf
EndSwitch
WEnd
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