How to limit fields that are editable with Inline Edit
It's not yet possible to limit the fields that are editable with Inline Edit. We're planning on adding this functionality in a future release.
A workaround in GravityView
To limit editable fields in GravityView, you can add a Custom Content field instead of the original fields. In each Custom Content field, add a Merge Tag with the field value.
This way, these fields will still display their values, but they won't be editable by Inline Edit because Custom Content fields are not editable with Inline Edit.