unread mail in icloud
Is it possible to set up a filter to show all unread e-mails in iCloud in the Inbox?
Also can one be set up to show all the flagged messages in iCloud mail?
You mean to say in www.icloud.com
See https://support.apple.com/guide/icloud/sort-and-filter-email-mm6b1a12f9/icloud
Click on that blue filter , tap once on unread and check mark the flagged .