Application header disappears

Hi! I want to be able to change the application header from a configuration menu (e.g. “Application X”, “Application X (Test)”).  I created a “config” entity that contains the application title. In the layout (a separate module), I use a snippet with a microflow that retrieves the header from the database. When I select the header in my configuration menu, it gets displayed.  However, as soon as I call another page, the header disappears and only comes back with a page reload (F5).  How can I make the header “sticky”? Thanks in advance!  
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