Exclude Generated Objects - SQL Developer
There is no such thing. Unfortunately you can not create fully customized filters, you can use only the predefined ones. Even if you could, there is no reliable way of filtering built-in objects. Starting with 12c, there is a new column in the USER|ALL|DBA_OBJECTS views, called ORACLE_MAINTAINED, but we can not rely on that, because its is not accurate (for example, AWR objects or some built-in directories and queues are not accounted as maintained by Oracle). 

As it was already mentioned, do not use SYS, that is for administrative tasks. Create your own user, and log in as that user.