Hi Rajat o/
I don't know anything about settings that might hide the option to add to your employment history, but you might need to scroll down quite a bit in order to get to this option. I attached a screenshot of where to find the "Employment History" and "Edit" fields in your profile.
The work history and feedback on your profile is a record of projects and feedback that you earned through Upwork. If you wanted to add your previous working experiences, please do so by scrolling down to the employment history option on your profile and click on the pencil icon to edit.
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