The terrain detail setting adjusts both the grass draw distance and terrain polygon detail levels, when these should be separate settings.
We can set the normal draw distance as far as 12km, also pretty high distances for objects as well, but grass drawing distance is somehow omitted from these sliders.
Suggestion:
Keep this:
Then add:
This issue was processed by our team and will be looked into. We thank you for your feedback.
Please keep the issue monitored to see when it is fixed.
An example:
Looking through a think batch of grass with the scopes hurts the FPS quite a lot, but grass in the distance has less of an impact. In this scenario, it'd be more efficient to have less dense grass overall, but drawn over a larger distance.
Also since rendering land polygons (opaque, not overlapped) is quite different from rendering grass (transparent, a lot of overlap), it's weird that they are controlled by the same setting.