What is the business reason for this request?
The user access is generally managed by the use of authorization. If users don't have authorization to change certain data, they won't be able to do that, even if the corresponding tabs are visible.
If this is just a matter of preference, then I would urge your customer to reconsider. To my knowledge, this may be achieved only by means of modification. The customer should be aware of the consequences and cost (including future maintenance) involved.
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