How yours looks is how my BRP 7 does. I must have done something with the 8.1 installation but no idea what. So annoying.
Update - finally figured it out by comparing folders.
I added an extra optional mod in error after installing. [HijackHornet] HS2_UIScalerAndWidescreenSupport v1.0. That one may be something along the lines of what you were looking for.
Thanks for this hint - it works but unfortunately has some disadvantages respectively important functions missing.
After install the creator looks first like your pic from R8.1 with the Plugins default Scale 1.0.
The scale for my screen above seems to be about 0.8.
I changed the scale to 0.6, this looks like:
Here you see that the 2 windows right down (Settings and Plugin settings) aren´t affected by this Plugin and stay like default.
The Settings window left side, the icons above and the Slider window right above are getting smaller, but unfortunately shows exactly the same content as before. No chance to resize these windows by drawing with the mouse to get more content visible.
But this would have been my goal.
Only the space for the character is growing, but thats for nothing.
What a disappointment
