Step 1. Go to libraries
Click the menu icon on the top left of your screen and click Libraries in the main menu.
Step 2. Manage a library
Click the gear icon on the library tile to manage the library.
Step 3. Choose move
Point to a group or item and click its 3-dot icon on the right side of the page. For a group, choose Move group or Move items. For a single item, choose Move.
Step 4. Select a library and group
Select the items you want to move if you chose Move items (or Select All). Select the library you're moving to, select a group to put the items in, and click Move.