Hi,
This is something you can not control from within Acymailing. You can however do this by adding some css to your site's custom css.
.frontcampaigns_new_email .acym__selection__card:nth-child(2), .acym__selection__card:nth-child(3) {
display:none !important;
}
You might as well consider to hide the bcc field. When used it sends a copy of each and every mail you send, If you use it wrong you reveal all your users to someone.
.frontcampaigns_send_settings .grid-x.acym__campaign__sendsettings__bcc {
display: none !important;
}
As for the frontend statistics page, this had not been added to v6 yet. Please be patient, Acyba will bring it back.