Go to Project settings > Fields where you will find that project's field configuration scheme. You'll see each field and their optional/required settings.
Yeah, sure.
See attached image
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You should keep in mind that this field configuration scheme might be shared among other projects. So if you change it, other projects might be affected in the same manner.
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It is important to note that the type of Project is also relevant. If it is a next-gen project, mandatory fields are not available at present. This option is currently available only in Classic Projects.
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