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With 
Distort, you can drag the handles in any direction to distort a selection. Content is automatically stretched to fit the confines of the newly-shaped bounding box.
Since they aren’t constrained to 90 degrees, you can use them to create a sense of perspective or speed.Move the handles to force perspective upon the contents of the bounding box.
NOTE: you can use Distort in conjunction with perspective guides to fit something into an existing scene.
What is the bias
When using Distort, you will see a manipulator in the middle of the bounding box 
. This is the bias. Use it to foreshorten, change the proportions of a sketch, or change the actions of a character.
Distorting a selection in Sketchbook Pro for desktop
- In the toolbar, tap
Transform and select 
. A bounding box appears surrounding the content. - Tap-drag the outer handles
to change the bounding box and distort the content inside it - Tap-drag the central handle, Bias, to foreshorten or change the proportions of the selection
Distorting multiple layers
Select multiple layers, using Shift, then tap . Tap-drag the handles of the bounding box to distort the content across all the selected layers.
Distorting a selection in Sketchbook for mobile devices
Tap 
Transform and select . A bounding box appears surrounding the content.
Tap-drag the outer handles to automatically stretch the content to fit the confines of the newly-shaped bounding box.
Tap-drag the central handle, Bias, to foreshorten or change the proportions of a sketch, such as changing the actions of a character.
