[SalesForce] How to make field read only from page layout for particualr User

I've one object obj1 and field on that object field1 and one profile Billing User.

one Custom Button on obj1. when click on button. it will check the field1 to true for all the profile.

But i want field1 such that it should read only from page layout but it edit from apex, only for Billing User Profile.

how can i do?

Best Answer

You can set the field as Read Only on page layout.

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