disable banners in page header

disable banners in page header

Hello,
 i would like to disable all the banners with suggestions which appear at the top of the page. This includes banners related to security issues, administrative log warnings and other messages.

I tried the solution suggested in this topic: https://pitstop.manageengine.com/portal/en/community/topic/hide-security-risk-banner

but I get an error message in the log window which says: "String index out of range: -1 Check logs for details."

Are there any suggestions on how to achieve this?

Thank you, Martin

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