Change method of session-cookie at multi install

Question

Hi everyone.

Log in can be done also to the management screen on the other sites by logging in the management screen when two or more sites are installed in the same domain.

To deal with this, I want to modify "qa_session" of qa-include/qa-app-users.php.
setcookie(PATH[4th parameter]) of qa_set_session_cookie() and qa_clear_session_cookie() function ?

Please teach the better correction method.

Best regards.

Comments

It did not move correctly only by modify setcookie(qa_session) of qa-app-users.php and qa-page.php. DB too ?

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Login authentication doesn't work when it is accessed from same IP address by the 2 or more system installed in a different folder. Why ???