Do component content entities have view modes?
No. Component content entities do not have view modes.
No. Component content entities do not have view modes.
You can create more than one template to provide layout and style alternatives with the use of the template selector.
Yes, you can render react components.
No, the entity browser does not work for component defaults as the entities are content, not config.
Yes, you can add custom functionality to your site through the use of custom Drupal modules, sub-themes, and custom elements.
Yes. If you're a developer you can create your own custom elements. These will appear within the 'Custom element' category in the Sidebar browser.
Yes. If you develop your own Custom elements you can use them within Components and make their fields editable within your them.
The Youtube video embed is responsive so it should expand to the width of its parent. If you do need to set a width you can apply the Width CSS property through the Style Builder.
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