Thanks for reaching out. Are you pertaining to the virtual remote in the Google Home app? If yes, can you see the option that says open remote when you tap your Chromecast in the device card? Please try to uninstall and reinstall the Google Home app and reboot your phone. Also, check this support website article to see more information about the virtual remote.
Just checking in to make sure that you've seen my response. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.