If you want to set the size of your shapes to be pixel-perfect, you usually use the corresponding section in the Arrange tab of the Format panel. But sometimes you want to adjust the shape freehand. By default, draw.io uses 10 pixel steps here. But you can also go with 1-pixel steps. Just grab a corner of your shape with your mouse and press and hold the Alt key.
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.