Thank you very much! It worked. I had the wireless screen sharing from Windows 10 to LG OLED display working very reliably. At some point of time it stopped working. I do not know what caused this - might be several things: I upgrades FW from 5.0.0 to 5.0.3, probably some Windows updates as well.
I was able to connect as Other device but not as wireless display. I had to enable Wifi on TV - don't know how it got displayed - and it worked reliably again.