How to delete all keys in a Segment?

Question

Is there a way to delete all keys in a segment in one action, rather than deleting each key individually?

Answer

It is possible to delete all keys from the Segment UI:

1. Locate the down arrow on top of the checkboxes column
2. Click on it, it will show two menu items,
3. Select all records from there, then "Delete" button will show up.