hey amused, if you are in arrangement view press control+L , or you can find it under the setup tab , its pretty cool function ,you can drag and drop sequences as well. the difference with this list is you can browse the contents of you project.
If what you need is in another project ,when you are in the project page 1st press control+L to bring up your list, then import the whole project into your new one so everything is accessable from the list control+I, then just erase what you don’t need like the device folder or sequences you don’t need.