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Akshay MenseAkshay Mense 

Does Hiding Custom field from page layout deletes its existing data?

Hi, 

Does Hiding Custom field from page layout deletes its existing data? can we manupulate the data after hiding it from page layout in the backend?
ShivankurShivankur (Salesforce Developers) 
Hi Akshay,

Hiding a custom field from page layout will not delete the existing data, adding the field in page layout is for visibility and UI accessibility option.

You can still modify the field data in the backend.

Learn more about it here:
https://trailhead.salesforce.com/en/content/learn/modules/lex_customization/lex_customization_page_layouts

Hope above information helps. Please mark as Best Answer so that it can help others in future.

Thanks.