Why the file size is reduced when the visibility of the layer is hidden?

With the same PSD file, I have hidden the visibility layer and recorded another copy, and I noticed that the file size is significantly reduced.

Anyone know why?

Thank you

When you maximize the verified compatibility, Photoshop records a version flattened your file in the psd. When you hide the layers and save, of course, the flattened version will consist of your file psd with these missing layers. If these layers had a lot of additional information, as opposed to simply a lot of white space or easily compressible full areas, then you will see a difference in file size.

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