Why 'Done' button is grey when downgrading iCloud storage to 5GB?

R: "Done button when choosing downgrade to 50GB in not grey, but grey for 5GB,

i need to solve it, please Apple Support help to check and solve it."

We are all Apple users, like yourself in the community. We'd like to help, however.

(There are links to Appl Support at top right, & at bottom left.)

Seems you may have more than 5 Gb stored in iCloud, (maybe less than the 50 Gb) ... you may want to download or archive what is synced there if you do not want to lose whatever is still in sync with device(s) / computer(s) etc.

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ie: Unless sync of excess apps data is turned off in iCloud, anything over 5Gb would likely be deleted from all computers / devices where it is in sync., if it wasn't greyed out,

For safe-keeping: You can: Archive or make copies of the information you store in iCloud - Apple Support

and

If needed: How to back up your iPhone, iPad, and iPod touch - Apple Support for safe-keeping

How to: Check your iCloud storage on iCloud.com - Apple Support see if you can have less than the 5Gb stored

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More info: if needed: How to: Downgrade or cancel your iCloud+ plan - Apple Support

Eg: says:

1. If you downgrade to the free iCloud plan, you will no longer have access to iCloud+ features like Hide My Email, Private Relay, and HomeKit Secure Video support. (2 Not all features are available in all countries or regions.