Most common questions used to investigate
Is your Instagram account a business account?
Are you currently running the Instagram app on your mobile device?
Are you currently browsing the Instagram site?
Common conclusions
Sorry, but the privacy settings can't be changed for a business accounts.
To change your privacy settings, go to your profile, then tap the icon of the three horizontal lines. Next, tap settings, then tap privacy, then tap account privacy and select your preferred privacy setting.
To change your privacy settings, click on the profile icon, then click on the settings icon. Next, click on privacy and security and under account privacy select your preferred privacy setting.
Sorry, but to change privacy settings on Instagram you must either run the app on your mobile device or browse the site on your computer
References
https://help.instagram.com/196883487377501
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