fail to redirect

When I log in on example.com/mylogin/ works fine and takes me to /wp-admin/, but then I open a new tab on browser and write example.com/mylogin/ shows me again the login page (as if session has ended), and I expect to be redirected to /wp-admin/ so if I open a new tab and write example.com/wp-admin/ there is no problem because the session is still valid

https://ww.wp.xz.cn/plugins/wps-hide-login/