The draw.io Board editor is meant to suit you as a whiteboarding tool primarily. There is no grid, and we use our sketch mode per default to experience a hand-drawn whiteboard. If you like to use the Board editor for classic diagrams, you can change the global settings within seconds to have a clean look and have a grid in the background.
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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.