In the issue type section you can filter by name, type, and related schemes. Like in Projects, you can search in the different columns with different parameters.
|Filter by||Searchable items|
|Issue type schemes||Name|
As you can see, all issue types show an individual ID.
The default issue type scheme will always be shown at the bottom of the list no matter which filter you activated.
Issue type schemes can be filtered by name, issue types, or projects. (See the table above).
Only dedicated items will show up in the drop down menu.
The section sub-task is only available if sub-tasks have been defined. Sub-tasks can only be filtered by name. (See the table above).