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Is there a way lo load an epub published online already in full screen and not depend on the user to click the full screen button?
Do you mean a Publish Online document?
The only way I know to force this is to grab the embed code and make that part of the page from which the user will jump to, or view, the Publish Online document. Embed code by default makes the doc full screen.
This embed code will put a mini version of your Publish Online document part of your web page. Here's more info: https://creativepro.com/publish-online-supports-embedding-indesign-documents/
Keep in mind that some browsers don't always support full screen mode.