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Hello

I see you are a paid subscriber (Thank you!).  And iPhone 14 Pro is certainly a supported device.  You should have access to these features in the Masking tab, in Edit mode.  Are you signed into the app with the same email address you used to post for help?  (You are not signed into a different, unpaid account, are you?)

Please check https://helpx.adobe.com/lightroom-cc/using/masking-mobile-ios.html 

If you look at the How To info for Masking features on this page, and still cannot access, sharing a screenshot or video screen recording showing your workflow may help us understand the problem.