Folders for new mail account in the wrong place in the folder pane
One of my mail accounts set up in Thunderbird is a Plusnet account. I moved a subfolder to the top level of that account in the folders view, but instead of appearing in the same list of all the other folders in that account it appeared as a subfolder of that account in the Inbox list of accounts.
Having tried everything I decided to delete the whole account from Thunderbird and recreate. That only made things worse - now all of the folders in the newly re-added account appear under it in the Inbox part of the tree.
In the picture which I've obfuscated slightly by changing all the account names to generic names. "My mail account 1/2/3" are existing accounts. Note that for My mail account 1 the folders of that account appear under that specific account. For newly (re-)added account, which used to behave in the same way until (a) I tried moving one its subfolders and (b) removed it from Thunderbird and re-added it, the folders appear as a subfolder of it under Inbox.
How do I get these folders to appear in the correct place and not under Inbox?
This is not a Plusnet feature, one of my other accounts is also with Plusnet and that behaves correctly.
Wšykne wótegrona (2)
Any suggestions please???
I tried reverting to an earlier version of Thunderbird (115.4.3) since this problem only occurred very recently (last week). No change. So I tried removing the offending mail account, and all the local message data, then adding it again. It's even worse now. The newly added account appears in the folder pane under "All folders" but does not appear in the 'Unified Folders' list, all other mail accounts do appear in that list. AND the mail folders in the newly added account still appear as a subfolder of its Inbox which they are not. I'm close to investigating alternative mail clients, something has gone terribly wrong with the folder handling in Thunderbird.