Right click inside app and select "Inspect Element" option:
Developer tool menu will look like this:
Select "Application" tab:
Now you can delete complete data with "Clear site data"
Guide to delete all the data related to app, including patterns database, user preferences, etc.
<aside> 💡 You won't able to rollback any database loss or any other data
</aside>
Steps to delete all data related to app:
Right click inside app and select "Inspect Element" option:
Developer tool menu will look like this:
Select "Application" tab:
Now you can delete complete data with "Clear site data"