How to turn off or change reflection of glass / translucent materials?

Hey people,

I’ve got a problem with a way too visible reflection of my window, it nearly looks like a mirror and I can’t find any way to turn this reflection down or decrease it.
Can anyone help me please?

Informations:
The Material Blend Mode is “Translucent” and the Lighting Mode is “Surface Translucency Volume”. For the Project I also use Lumen.
In the image of the scene you can see on the right side the weird reflection of the TV in the window.