Better to stay with latest version as this is a web Development tool and nothing in the tool need to be downloaded so all will use the one and the same.
Thant is part of the continuous development. Thanks to the Thunkable development tool.
The name is Design so it is kept for what you can design with.
The name invisible is by itself misleading, They are now part of the coding blocks.
[NOTE]
I’m a user in the community and not working for Thunkable.