WORKAROUND
1. Click on the filter button
2. Check the 'View/Edit Query before executing' option | OK
3. The following query will display
Select u.*, v.*
from sys.DBA_USERS u, sys.v_$pwfile_users v
where 1=1
and (exists (SELECT null
FROM DBA_OBJECTS o
WHERE o.OWNER = U.USERNAME)
and u.username = v.username(+)
4. Add a close parenthesis ')' after U.USERNAME) i.e.
Select u.*, v.*
from sys.DBA_USERS u, sys.v_$pwfile_users v
where 1=1
and (exists (SELECT null
FROM DBA_OBJECTS o
WHERE o.OWNER = U.USERNAME))
and u.username = v.username(+)
STATUS
Issue fixed in version 12.8. The latest version can be downloaded here.