WebDriver: '--app' option does not work in Opera (operadriver.exe)

[SEKOMD]

Hello everyone!

I need a window with a title that loads a website (in the future, it will just have a text field as I'm creating a text editor on different engines).
I managed to achieve this in Chrome and Edge, but in Opera, it's not working. The --app parameter in Opera doesn't work. Could you please advise me? Maybe I'm not launching it correctly, or perhaps there is another parameter?

Just need to launch Opera window without tabs, address bar, and with a loaded website like Google, for instance.

 

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#include "wd_core.au3"
#include "wd_capabilities.au3"
#include "wd_helper.au3"

Global $sBrowserType = 'Chrome' ;it works
;Global $sBrowserType = 'Opera' ;doesn't work

$_WD_GetFreePort = _WD_GetFreePort()

If $sBrowserType = 'Opera' Then
    _WD_Option('Driver', 'operadriver.exe')
Else
    _WD_Option('Driver', 'chromedriver.exe')
EndIf

_WD_Option('Port', $_WD_GetFreePort)
_WD_Option('DriverParams', '--verbose --log trace --port=' & $_WD_GetFreePort)

_WD_CapabilitiesStartup()
If $sBrowserType = 'Opera' Then
    _WD_CapabilitiesAdd('alwaysMatch', 'opera')
Else
    _WD_CapabilitiesAdd('alwaysMatch', 'chrome')
EndIf

_WD_CapabilitiesAdd('browserName', 'chrome')
_WD_CapabilitiesAdd('w3c', True)
_WD_CapabilitiesAdd('acceptInsecureCerts', True)

;This parameter should keep the window title, the window itself, and the actual site.
;It works in Chrome but doesn't work in Opera.
_WD_CapabilitiesAdd('args', '--app=https://myip.com') ;<<!?

_WD_Startup()

$sSession = _WD_CreateSession(_WD_CapabilitiesGet())
;_WD_Navigate($sSession, 'https://myip.com')

MsgBox(64, '', 'Wait')

_WD_DeleteSession($sSession)
_WD_Shutdown()

Exit

Can someone please help me out? Does anyone have any ideas? 

Applying these settings (almost forcibly):

_WD_Option('Driver', 'chromedriver.exe')

_WD_CapabilitiesAdd('binary', 'C:\Users\EM\AppData\Local\Programs\Opera\opera.exe') ;forced

Still didn't have any effect.

Edited June 18 by SEKOMD