There isn't anything custom on the login page, but the version of the framework is 4.2.1. I'll be updating it to 4.3.1 and let you know if the issue remains
Yes it's working
Check the docs before asking a question: https://docs.abp.io/en/commercial/latest/ Check the samples, to see the basic tasks: https://docs.abp.io/en/commercial/latest/samples/index The exact solution to your question may have been answered before, please use the search on the homepage.
3.Login Identity Server page is opened instead of the main page of the application There are couple of questions about redirection issues on support page and the workaround solutions did not work for our project, I already have "RedirectAllowedUrls": "http://localhost:4200" in my appsettings.json file