Depth of Field Not Working?

Hey people!
Startet with unreal for 2 years ago and I still struggling with the DOF setup (not working)
My frames are always in focus, but I want to have the mountains blured and the house sharp. No matter how I tweak the setting (watch almost every tutorial) on the camera, I dont get the blur effect (in Version 4 and 5). Just if i put the focus infront of the camera I get the DOF and thats it (pictures attached). Did I miss a overall setting?
Now I am working with : Manual Focus Distance and Current Aperture on the camera (and all other setting)
So thankful for tips. Thank you Chris

It’s possible that a soft background is impossible to achieve with the lens you are using for this shot. Try a longer focal length?