I don't recall seeing that before. If your email address is now on the new TalkTalk mail platform then the folder view is on the left side of the display and sub folders will be viewed by selecting the right arrow to the left of the main folder that contains the sub folders.
Do you see them?
Ah, you're using the mobile version of TalkTalk Mail. The layout is slightly different to a larger display with the expand folder view right arrow to the extreme right of My Folders - but you've found the folders so that's good.
They're personal folders. All individual so they'll have to be dealt with individually. They look to be copies of standard folders. Have you previously used email aliases and they're the folders for the alias email accounts?
I see that Inbox 1 1.Spam has got 3 unread emails in it. I guess you probably don't want those but if you do wish to check through the folders to see what emails they contain then just tap on the folder name. It'll indicate Empty if there's nothing there. Any emails will show which email address they've been sent To which may give you a clue as to why the folders are there.
Select < Folders to return to the folder view.
To delete the folders:
I just deleted all the folders and it took me over 30 minutes. I logged out and into webmail again and they are back. This is only for one email alias - I have others with the same problem. I checked the emails and they are all addressed to the same address. It is now impossible to use Outlook on my Mac at home because of the constant error messages saying that the folder names are too long. Deleting the folders in Outlook does not work either btw.
One or other of your email clients / apps are causing the folders on the device to reappear in the webmail mailbox.
If it were me I'd be sure that everything I wanted was in the standard folders in Webmail or save wanted emails to a local folder on the MAC or to the email account and I'd then delete the email account in Outlook and any other clients / apps that are synchronising to the mailbox so I could be positive that I'm just dealing with the webmail mailbox on its own without any other device resynchronising those unwanted folders.
Delete those unwanted My Folders and this time they shouldn't reappear. Try it with a few just to test they don't come back.
Then when you're sure the mailbox is working as expected, add the email account back into Outlook.