- Export settings from current version to file.
- Download preferred older version from GitHub: Releases · thunderbird/thunderbird-android · GitHub . I downgraded and stuck to 6.804 before all the broken UI and the changes that made the app unusable.
- Uninstall current version.
- Install older version from apk.
- Disable auto-updates for the app in Play Store and/or F-Droid.
- Start app and import settings from file.
- Re-enter passwords for configured accounts.
- Enjoy.
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