I take no responsibility for you messing anything up. Below are the steps I took to get back my Garmin Connect.
- Uninstall connect
 - Download Garmin Connect 4.77.1 from https://www.apkmirror.com/apk/garmin/garmin-connect-mobile/garmin-connect-mobile-4-77-1-release/
 - Install APK installer from the app store
 - Grant APK installer the necessary permissions
 - Install the downloaded Garmin Connect 4.77.1
 - Enjoy the good old interface. F the new one.
 
Edit:
- You must disable auto updates for connect by going to it in the play store, click the three dots and uncheck "Auto update".
 - Default settings should be fine in apk installer.
 - Not all phones require apk installer, some phones have functions/software to install apk files.
 - 4.77.1 is not a must, choose any previous version of your liking.