im not able to open icloud setting in iphone 14 pro max

See what posted:

Do you have a MDM profile?

If so, contact your company - IT department.

or

Is it a private iPhone, see -> Use parental controls on your child's iPhone, iPad and iPod touch

Use parental controls on your child's iPhone, iPad and iPod touch – Apple Support (UK)

• Check restrictions -> tap Settings -> Screen Time -> Content & Privacy -> scroll to Allow Changes.

Do you have a MDM profile?

If so, contact your company - IT department.

or

Is it a private iPhone, see -> Use parental controls on your child's iPhone, iPad and iPod touch

Use parental controls on your child's iPhone, iPad and iPod touch – Apple Support (UK)

• Check restrictions -> tap Settings -> Screen Time -> Content & Privacy -> scroll to Allow Changes.

Though it is not clear what is not opening I would suggest you to please check your Screen Time Restrictions if any.

It would be better if you can please re-post with a screenshot, in order to understand the phenomenon better. Images/pictures speak louder than words. 

Please understand this is a public forum: While attaching a Screenshot, do not provide any personal credentials, such as IP address, Card detail, email id, apple id, IMEI number, Serial Number, Phone number, Order ID, if you are sharing a map ensure your location is not identifiable, etc.

With the limited information that you have provided, It is hard to even guess the problems faced by you. 

You may get faster and better responses to your query by --> Writing an effective Apple Support Commun… - Apple ...

Please re-post with detail so that someone else can help.

Use iCloud.com to restore and recover iCloud information

You can use iCloud.com on a computer to recover recently deleted files or restore an earlier version of information that was automatically archived in iCloud.

See any of the following:

• Calendar: Restore your calendars and events on iCloud.com
• Contacts: Restore contacts stored in iCloud on iCloud.com
• iCloud Drive, Pages, Numbers and Keynote: Recover deleted files on iCloud.com
• iCloud Photos: Delete and recover photos and videos on iCloud.com
• Mail: Delete email in Mail on iCloud.com
• Notes: Delete and recover notes on iCloud.com
• Reminders: Restore your reminders on iCloud.com
• Safari bookmarks and Reading List: Restore your Safari bookmarks and Reading List on iCloud.com

Watch the GIF below. What is already synced to iCloud is not backed up. The remaining you can enable disable.