By default, draw.io shapes snap to the grid when you move shapes with the mouse. However, you can fine-tune shapes using the cursor keys. This way, it is possible that connecting lines are no longer 100% straight. You can use the Snap to Grid function to quickly and easily realign shapes and straighten your connectors.
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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.