Row block - layout: divider and spacer
Content blocks section - row block
Divider and spacer are part of the row block.
Divider and spacer blocks have settings that are repeated across sections and blocks. They can be found in the Global settings category.
For more details, read these articles:
Divider block: https://docs.muup.co/article/4980-divider-block
Spacer block: https://docs.muup.co/article/4979-spacer-block