Problem:
Sometimes when we create a new field on any object we don’t get the option to select it’s FLS for different profiles and also the option to add the field on the particular page layout.Let’s find out the reason behind it.
Reason:
When we make any field required while creation, it becomes required for all the profiles and mandatory for all page layouts.
Solution:
If you want to provide different FLS settings for all the profiles and want to add on particular page layouts then make field required at page layout not while creating the field.
SFDCWallah 
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