You can modify dynamic block definitions in the Block Editor.
After you've defined a dynamic block, you can modify it in the Block Editor. You can delete, add, and modify the following elements in the Block Editor:
You can also use the BACTIONSET command to change an action's selection set. If you delete a parameter associated with an action and need to reassign that action to another parameter, use the BASSOCIATE command.
).After you modify a dynamic block definition in the Block Editor, you must save your changes (see