Reload Libraries
Changes made via Library Manager will take place when you click OK to close the Library Manager. For example, if you add a library to the project, clicking OK will reload your libraries (and load the newly added one) and close the Library Manager.
You can also reload libraries without closing Library Manager: from the green “Refresh/Reload” icon in Library Manager, choose Reload libraries and apply all changes. All libraries will be reloaded, provided that you have made modifications that necessitate a library reload.
Simplified management: Project or Server administrator
Detailed management: Modify details
Refresh Status of Placed Objects
From the green “Refresh/Reload” icon in Library Manager, choose Refresh status of placed objects: this will refresh the list of missing and substituted objects in the Library Manager tree structure.