The OpenSearch documentation isn’t explicit about how to change the branding for the login page. The documentation here:
https://opensearch.org/docs/latest/dashboards/branding/
does a great job in detailing how to change the branding once you are past the login page. However, what if we’d like to change the login page itself?
Turns out it’s as simple as adding the following to your opensearch-dashboards.yml:
opensearch_security.ui.basicauth.login.title: "Please Login to whatever you want"
opensearch_security.ui.basicauth.login.brandimage: "http://example.com"
David Vassallo's Blog 
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