Help CenterPress Control+Command+J or press File > Library Properties in Final Cut Pro to bring up Library properties. On the right side of FCP, click the Modify Settings in the Storage Locations section.
Next, please check that your "Motion Content" settings are set to "in Motion Templates" and not "in Library." If the settings are incorrect, please change it.
After changing the setting, close FCP. Then reinstall the plugin.
After you have reinstalled the plugin, reopen FCP to test. In most cases, the plugin that is already on the timeline should be restored. However in some cases, you may find yourself needing to reapply a new plugin preset to the timeline.