Thank you in advance.
Best answer by rikkster
Navigate to Settings > Apps & Notifications - tap App Info. Tap the three dots in the upper right hand corner of the screen, then tap 'Show system'. Scroll down to and tap 'LG Keyboard'. Select 'Storage'.
Clearing the cache will have no effect in removing recently used emojis. Tapping the 'Clear data' button and then OK, will. This action will not remove text messages. However, if you've made customizations to the Messages app, the app will return to its default state. For example, if you've enabled dark mode, the Messages app will revert to light mode. Easy fix. Tap the three dots in the upper right hand of screen in the Messages app to enable dark mode.
Also, the Messages app will revert to using Google's keyboard (Gboard). Swipe down from the notification area while in the Messages app, and you should see the option to change back to English - LG Keyboard.