Normally Ctrl+B = Browse to Asset in UE
However in UEFN, this often does not work on objected came with island template.
@pto2k Thank you for your report! We would like to look into this further, would you be able to submit a bug report using the form available here: Fortnite Creative
Its because asset folders for things like FN static meshes are locked and cant be accessed by users. The blueprint class is the one you can access only.