You can easily replace shapes by simply dragging and dropping the new shapes over the existing ones. But it can be done even faster! Just select the shape you want to change, press and hold the Shift key and click on the new shape in the library.
View our playlist on shortcuts: https://drawio.link/shortcuts
See all of our shortcuts here: https://drawio.link/shortcutlist
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Or learn more about diagramming with draw.io at https://drawio-app.com/learning. You can also take a look at our blog (https://drawio-app.com/blog) to always stay up-to-date on new draw.io features in Confluence.