The initial Share screen is very confusing
There are so many options; the screen is overwhelming
Acrobat Reader 18.12.00 provides the "Share a Flattened Copy" option in Settings > Preferences.
Please see this document for more details.
Agreed, and it’s now no longer possible to send flattened copy to the client after you have made changes to a fillable form.
If there is a way I would love to know?