You will not be able to hide the second dashboard on the Server. The only way to do that would be to deny viewers from seeing it by setting permissions but this will prevent them from seeing it altogether.
To achieve the desired effect I would recommend embedding the dashboard onto your own application. This way the users will not see nor interact with the Server UI.
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Adding to what Sasha said, you could send them the link of the dashboard rather than suggesting them to navigate to the dashboard using the folder structure. If you're able to send the link,, then you can add URL parameters into Tableau dashboard link where you can hide the tabs.
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