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.
We recommend using decimals e.g. 1.3 as this makes the line height relate to your font size.
It depends on the font you are using. If you have individual files for each font, you should upload zip files for each weight.
No, the entity browser does not work for component defaults as the entities are content, not config.
No site specific data is stored on the API.
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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