Under Big Sur my Mail Trash folder is missing from my favorites. How do I get it back?

Hi. Thanks for all the helpful info. After doing the above, my deleted mail was still not syncing to the iCloud All Trash folder. I have four non-apple email accounts ... and the other three all had a 'Trash' folder that synced to the respective 'All Trash' folder. However, after updating to Big Sur in my iCloud account a new folder named 'Deleted Items' appeared instead of a 'Trash' folder. I solved the email syncing to the correct icloud 'All Trash' folder by taking the following steps ... >Mail >Preferences >Accounts >iCloud IMAP >Trash Mailbox >Click and choose 'Deleted Items' folder. Now all my deleted mail shows (as it does in 'Trash' on other Apple devices). Hope this is helpful.