How to use swipe on the delete key to select and delete text in Microsoft SwiftKey Keyboard?

With Microsoft SwiftKey, you can erase an error, mistakes or maybe just something you would like to delete — with the swipe of a finger.
 

When you want to erase a word or multiple words, touch your finger to the Backspace key (the key to the right of "m") and immediately slide it toward the left.
The farther you slide it, more words will be highlighted and selected to delete. If you select too much, no worries: Just slide your finger back towards the right.
When you're all set, simply lift up your finger and all your unwanted words will be deleted.
 

You can turn the 'Quick Delete' setting on and off by following the below instructions:

• Open your Microsoft SwiftKey app

• Tap 'Typing'

• Check/uncheck the Quick Delete option