Hi,
For your first issue, where the customer is logged off and the thank you page is not displayed, please configure the following options in the plugin’s settings:
Blocking > Log out unverified users > Disable the options here
For your second issue of the notice not displaying, please enable the option under: General > Redirect on failure you can leave the custom redirect URL blank
To manually verify users, first enable the option under Admin > Verified Column > Add “Verified” column to the admin “Users” list also enable Admin > Actions > Add links for manual email verification, unverification and email resend by admin