As mentioned in the comparison of Layout Builder in-line blocks versus global blocks, the in-line blocks also differ in that you deal with the block's configuration directly on the page through its own unique submenu.

In the screenshot shown to the right, you can see that, once the pen icon has been clicked, a submenu specific to in-line block displays showing the available options.

Each Section of your layout, represented by a blue bounding box with its own administrative label, contains a configuration option available from the pen icon in its upper left corner.

The configuration settings under Style this Section include three tabs: Layout, Appearance, and Section Styles.