Describe the bug

In the current classic editor, the "More" divider has a text label inside of it, to more clearly convey what the dotted line means:

The classic block removes that label:

I'm unsure if that was intentional or not, but I think including the label would be more clear — the dotted line on its own is confusing.

To Reproduce

1. Add a Classic block
2. Insert a "Read More" tag from the Classic bar's toolbar.