Earlier quoted context omitted.
It's switched on after powering up the TV, but then I just press twice the down-arrow on the remote and then the cursor disappears and appears only if I use the scroll wheel (which I never do)... .
Really? For the the cursor appears every single time I touch the remote . There is no disabling it.
Maybe it's a matter about setting the cursor "sensitivity" (or something similar)? In the "[TV options] -> Accessibility -> Pointer Options -> Tracking speed" mine is currently set to "slow". I did set it to "high" but in my case it did not make any difference (once I pushed twice the down/up arrow keys it did not reappear unless I actively shaked the remote)... :(
I did install all SW-updates that were available so far for that TV, but I had the same behaviour already in its original "unboxed" state... .