Is there an easy way to resize screenshot in macOS markup editor?

When you take a screenshot by pressing Command + Shift + 4, a preview pops up on bottom right. If you click it a program opens up, which I believe is called markup editor. Now in this program you can do most things. However, I've not been able to find a way to resize the screenshot. How do I find an easy way to resize the screenshot? I am running macOS Catalina.