Have your account received any messages? That may be a cause. If IMAP, rightclick on account name in folder pane and click 'subscribe' and see if you can set them up there.

Many thanks David for your quick response to my request for help! BUT, when I do as you recommend and tick the boxes nothing happens. Curious - so do you have any further thoughts?

I am unsure on whether the folders appear until there is a message there. And on that, I am tapped out. I wish you well and there are others here with more technical expertise who may respond.

Thanks David

You're very welcome. I wish I could have been more helpful.

For what it's worth, a folder with content still does not appear!

Go to View > Folders and verify if ✔︎ All Folders is selected.

Thanks Mapenzi - but where do I find the View option?

For Windows users the menu bar is hidden by default. Holding the Alt key will display it ... https://support.mozilla.org/en-US/kb/display-thunderbird-menus-and-toolbar#thunderbird:win11:tb147

Well, that gives me Unified Folders but not sub-folders for my new account!

I am sorry but you lost me with your last reply.

The procedure you suggested does not exhibit either the sub-folders in my Inbox or allow me to add other folders such as Sent. Drafts, Junk etc

May be we could help you more efficaciously if you showed us a screen shot with the contents of your folder pane. Otherwise it's like searching a needle in a haystack ... or waiting for Madame Soleil!

Thanks Mapenzi -attached is screenshot from my laptop which shows the lack of sub-folders and a screenshot from my iPad which correctly displays the sub-folders.

cid:986AD717-0A75-43AC-8950-9FC3173EDB48 blob:null/e65ec441-b7c7-4bec-b673-55e5092c4c80

Hopefully you can open these links?

Are these attachments better?

Are these attachments better?

Thank you for the screenshots. Yet regarding the screenshot with the Thunderbird folder pane I still wonder which of your accounts displays only "Sent and Deleted Folders" as you stated in your first message. I do see the @Oakdene account which indeed displays only the Inbox, Deleted and Spam folders. If this is the newly created account and if it is a POP account it is normal that in the beginning only Inbox and Deleted will be displayed. That's the default behaviour with new POP accounts in Thunderbird. A Sent folder will be created when you send your first message from this account, the Spam folder is created when you activate the Spam filter in Account Settings, the Drafts folder when you save a message as a draft, the Archives folder when you archive a message, ....etc

Your second image seems to show the same account set up on your smartphone, and probably it is set up using the IMAP protocol. Now the question is: did you really set up this account in Thunderbird using the IMAP or the POP protocol? If you used POP there will be no automatic synchronisation with the same account on the smartphone. If you used IMAP you'll have to open the "Subscribe" popup - as david already proposed in his first reply - and select the folders to be displayed. You said that you tried but to no avail ... Please show a screen shot with the "Folder list" of your account.