Hello,
Yes, this is an easy task in Photo Mechanic. Go to the Accessibility preference page and click the Metadata (IPTC) Template button in the Customize section on the left. You might have previously created a Snapshot menu entry for this configuration so click the lightning bolt button at the bottom to check. Click the entry if it exists to load that configuration.
If there isn't any Snapshot entry, then just uncheck the boxes in the Visible column, for any field you wish to hide. You can also click and drag a field or group of fields to a new location to make the Metadata Template easier to use. Click the OK button to save the changes. If you will be using this configuration at a later date, then you should save it in the Snapshot menu. Click the Lightning bolt button and then click the Save option. A dialog will open to give it a name. Call it something that will make sense in the future. Eg, Just Event fields.
regards,
--Bob