How can I access to created "View modes" in views and create a block of it?
Just skip this part of creating a View. Don't create a block or page display yet (that's what I do) and work on a master view. When you go select rendered content as a field, you will have view modes you created as options. Show "Content" as a view mode.

See this for more:


https://www.amazeelabs.com/en/blog/views-field-rewriting-to-views-modes