Switch to the Select tool, click the object you'd like to transform, and choose switch type on the object's context menu, then select what you'd like to transform it into.
Transforming a sticky note into a shape and a text box
The text and the color of your object will stay the same. Please note that transforming a sticky note into a text or a shape discards emojis and tags. Turning a shape or a text box into a sticky note adjusts the color to a similar one because there are limited colors available for stickies.
You can also rotate objects on your board and scale them. Select an object (the select tool should be enabled) and drag the special icon to rotate it. Note that certain objects (Kanban, mind map, tables) cannot be rotated.
To change the object size, drag the white dots. To change the width/length of a shape or a card, drag one of the object's sides.
Rotating and scaling a shape
Learn more about working with objects in this article.