I can’t find the recently deleted folder of voice memos. I got my iPhone 11 December 1st. Where can I find the recently deleted folder?

From support.apple.com : https://support.apple.com/guide/iphone/edit-or-delete-a-recording-iphc9bdaee83/ios

To recover a deleted recording, tap the Recently Deleted folder, tap the recording, then tap Recover. To recover or erase everything in the Recently Deleted folder, tap Edit above the Voice Memos list, then tap Recover All or Delete All.

Open Voice Memos, there should be a list 'recently deleted'