Please do the following in 'TPCloud -> Tokens':

1. Select the check box next to the token(s) you want to Archive
2. Select the Details option from the quick-menu
3. Select the Archive tokens option
4. Select the Archive option

This removes any archived tokens from the general token filter, but you can still review them by selecting the 'Archived Tokens' filter. Also, expired '21-Day Trials' will be automatically purged after 6 months.