Loginpage Issue

ello, I find the plugin very good, but I have the following problem: I gave the login page the URL https://baum-coaches.de/come-in/. When logging in through this URL, everything appears great. But if you still enter https://baum-coaches.de/wp-admin/, you also have the possibility to log in there, but without the design created with the plugin. How can I turn off the wp-admin page so that only the login page works for logging in?

The page I need help with: [log in to see the link]