Create subfolder under the inbox folder.
There is a possibility to create a subfolder for the inbox folder of the email account via CLI.
For Dovecot, for example, with the following command:
# doveadm mailbox create -u firstname.lastname@example.org -s INBOX.newfolder
It would be nice to have an option to create such folders via Plesk UI.
Thank you for your input! We will consider this functionality in upcoming releases if it is popular. Everyone, please continue voting for this feature if you consider it important.