Personalization feature versus "In-client" Designer feature in Web client

What are the differences between using the personalization feature and in-client designer feature with Web client? In Microsoft Dynamics 365 Business Central SaaS, with sandboxes you have both at hands, while in production you only have personalization. In shorts, there is also personalization feature that could be used if you want to add fields hidden on a page.

"In-client" Designer—you can use the "In-client" Designer feature to personalize your page:

Put the cursor on Customize Fields and select the Add Field to Page option. After a drag and drop operation on a selected ...

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