How can i add unlit materials and 3d UI to the archviz template without making it too shiny with colors as white as 10000 instead of 1

Development Architectural and Design Visualization
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In game projects, you can easily make unlit materials, 3d UI or decals but in architectural visualization template, due to the light range and auto-exposure:

  • unlit materials and 3d UI appear black. if you want to show them as white you have to set the value of the RGB components as something larger than 8000 or so which make them shine like the sun.
    Specially at night it is even worse.

Also the decal actor/component while not suffering from this issue, acts like a flash light (our decal is a white ring).

Is there an easy way to fix this?