How to add Back to app link on login page

Hi everyone,

I would like to know how to add a Back to App link on the keycloak login page.
I’m using a react front end, and when i use the method keycloak.login() i’m going to my keycloak server. And here i want to add the possibility to go back to my app on the redirectUri sent by the keycloak login method.

I don’t find any options in the realm management, and i have created a custom theme and i don’t get the name of the properties to acces to the redirectUri link.