The bar with url does not disappear I signed the application. I made a folder in public_html on my host with folder and file .well-known/assetlinks.json a folder and a file must be placed in the application or application must be signed only?
In Android Studio, goto Tools -> App Links Assistant -> Open Digital Assets Links Generator. From there, generate your digital assets file and upload the content generated to .well-known/assetlinks.json. Also, verify the SHA-256 key of the current build type of your app and the one uploaded to .well-known/assetlinks.json are same