Execute transaction code SE01. From the initial screen, set the User to *, select all options under the Request Type. For Request Status, you can choose Modifiable or Released and press Execute (F8). If you choose Modifiable, then you will get all the Modifiable state of transport requests.
Transport request with Modifiable status.
Transport request with Released status (you will see the small tick icon at the end of the transport number)
Alternatively, you can use transaction code SE10 and SE09. If you want to release the modifiable transport request, please follow this article, Released SAP Transport Request.
