Open Object Manager
Connect to a project source and open a project, as shown below:

From the Tools menu, click on ‘Find Unused Objects’, as shown below:

A ‘Search for Objects’ dialog box opens up. Different options such as name and location, type, date etc. can be specified to narrow down the search, as shown below:

For example, to find all the metrics that are not used in the project select Metric in the Object Types tab and click ‘Find Now,’ as shown below:

All the unused metric objects in the project are displayed in the search results window as soon the search is completed, as shown below: