How to hide Contract duration type and Contract Subtype in Contract Info

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We are implementing Oracle Core HR for our customer in France and they've asked us to hide the following 2 fields predefined by Oracle localization for France that they don't plan to use (Contract duration type, Contract Subtype).

I've tried several standard tools, but I cannot hide them:

• Flexfield with legislative data is not editable;
• Related Contract information in Transaction Design Studio is not editable;
• While selecting these fields in Page Composer, I'm also blocked for any changes.

Probably there are some other options to hide them?

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