You can use the Show/Hide Material dialog to remove materials from the Material list in the Feeds/Speeds And Cutting Data Tables dialog.
To display the Show/Hide Material dialog, select Features & Manufacturing tab > Materials tab > Show / Hide.
FeatureCAM comes with a long list of materials. Some of these materials might not be applicable for your shop. You can delete materials from the database, but when you upgrade to a new version, these deleted materials reappear. The solution is to hide unwanted material. When the materials database is updated, hidden materials do not reappear.
To hide or show a material: