Albums and Folders that were created in a Workspace can be moved to the Main Library. This will also move any assets that are house in the folder or album. 

See below for instructions:

1) Select the Library folder or any other folder within the folder tree so you can see folders and albums presented below. Select the albums and folders you would like to move:

2) Select either of the arrow icons:

3) Select the desired location where you would like to move the folder/album, click OK, and you're all set!