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I don't believe there is a setting to control this within Tableau Server. There does not appear to be a supported method of hiding the ability to change the password. However, I did find this 3rd party article that might help: Tableau 9.0, Vizportal, and Forcing Password Security | Tableau and Behold! However, you should take note of what the author shares in the opening paragraph:
Not recommended or supported by Tableau in any way. Make a copy of all your original files and be ready to have any changes overwritten with every maintenance release.
Great, thank you, Nathan, it helps.