This is very unorthodox, unless someone has an explanation but after a bit of "macgyvering" I got it to work!
Hopefully you can take a bit of info from below to get your setup to work.
The issue I was having with my L246WP monitor and windows 10, was an off centered image.
Read and researched many different posts about similar issues, mostly signal related, over a few days. Not too much on "off centered images" related to dp++ to HDMI/windows10.
My monitor with ONLY the dp-hdmi cable plugged in, was labelled as a TV Screen and not a digital display, as it is now.
Apparently one of the reasons why windows10 graphics card shifted the image...?!
Most solutions from forums explained modifiying the EDID and .inf etc, a bit too advanced for me and also did not want to mess up my registry on a brand new computer!
Solution; I then came across a CRU (Custom Resolution Utility v1.4.2, used setting 1920x1200 manual) in combination with both VGA and DP++->HDMI cords plugged in.
By leaving both plugged in, my monitor appeared as "digital display."
Also, windows thought I had 2 screens plugged in, so I changed the setting in "Display Settings" to "show only on 1"
My monitor input setting was also set to RGB (but displaying HDMI!).
The hdmi input setting showed no signal! So weird, yet the screen was clearly HDMI, with windows and programs opening smoother/faster than on the VGA setting.
Unplugging the VGA cord after setup was complete, also cut the hdmi signal...?
So I had to leave both plugged in.
Opened up the resolution and ratio settings in the "intel graphics settings" program at random, checked on and off the "override" box, and the image finally filled my screen.
Dont ask me why, but it worked!
Here is a link for the CRU. Download and use at your own risk, I am not responsible for what happens to your computer. Just know that it worked "A ok" for me! Its an older version but again, it worked!
When I restart I sometimes have to go back into the "intel graphics settings" because it shifts left again and play with the resolution and ratio settings.
I cannot seem to save the screen settings but with a lil patience its quickly fixed.