To remove Publish option from the More actions list go to Administration -> Settings -> Advanced -> ContentView -> Controls -> FrontendPages -> Views -> FrontendPagesListView -> Toolbar -> Sections -> toolbar -> Items -> MoreActionsPagesWidget -> MenuItems and delete them using the bucket icon.
Take a look at the screenshot:
After the item is removed, after you navigate to Pages -> More actions menu the Publish option will not be available.
Please review the second screenshot.
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