Big Sur email folders missing
After installing Big Sur, it appears the emails folders have been reorg'd. The Trash and Junk folders that were near the top have been moved to 'On My Mac' and they are missing most of their content. I clean out my Trash folder about every 6 months and there should be about 600 messages in there. Instead there are 29!
If I get an email in now, delete it and then search for it, I find it in Search - All Mailboxes but cannot find it anywhere else. Where are all these seemingly hidden emails located?
MacBook Air 13″, OS X 10.11