You can copy a style from one shape or connector to other shapes and connectors.
Start by setting a style for a shape or connector, then click on the shape to activate the Copy Style paintbrush icon in the Toolbar.
Clicking on the paintbrush will copy the style of the shape or connector you selected and your pointer will show as a paintbrush.
Click on the shape or connector you want to paste the style to and this will then make them have the same styles.
If you want to paste styles to multiple shapes, click the shape you want to copy and click the Copy Style icon.
Circle the shapes/connectors you want to apply the style to with your mouse.