After performing a skew, a popup toolbar becomes available from the bottom of the panel.

The popup allows you to manipulate your changes using a curve editor.

You have 3 different ways to modify the curve:
The curve helps you shape your skewed items, and makes it easy to create complex animations with ease

before changing the curve

after changing the curve
<aside> 🧙♂️ Pro Tip:
By default, the curve keeps handles inside the curve editor. However, if you are feeling wild today, hold down Ctrl / cmd while adjusting the curve to allow full freedom.

</aside>