With draw.io you can transfer the style of a shape to other shapes with two mouse clicks. Or set a default style, which will be automatically applied to all shapes you select from the Shape Library from that point on. If you like to set a universal styling for all shapes instead, you can “Select Vertices” feature instead (see https://answers.seibert-media.com/t/how-can-i-change-multiple-connectors-at-once-in-draw-io/1059).
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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.