I have found that when working with Unity, My text, apps and other things in Display settings was on 150%, Scaled it down to 100%.
I can now work in Unity with all the icons showing down the left hand side.
125% is the reccomended setting, but I find scaling down to that didnt work, all the icons on the desktop in Windows 10 look really small, and being the age I am find it hard to work with everything scaled down to 100% for anything other than Unity, Not sure about in game how it would look.
But for now I can work in Unity in Wide view with everything I needed, and will revert to the 125% when I am not.
The display is Duplicated, I did try to extend it, and also make screen 1 my default, it just reverted back to duplicated screen.
You are supposed to sign out and back in again after scaling down as some apps dont respond to the lower setting unless you do, but as I am only using it for Unity, I am going to skip that.