To select all connections, click “Edit” and select the option “Select Edges” (or use the shortcut Ctrl+Shift+E, which is Cmd+Shift+E on macOS). Now that you’ve selected all connectors, open the Property section in the Style tab of the Format panel and select “Flow Animation”. Of course, this option also works for single-flow animations.
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.