Just discovered, that first time (after upgrade to LibreELEC-RPi4.arm-10.0-nightly-20210415-23234b9.tar ) the long EPG header is rotating in Kodi - TV / Channels view.
That's a great improvement as earlier it was just cut so a part of EPG text was missing.
The bad is that it works just for a short time, then stops working and Kodi restart is necessary to have it working again.
Also in TV Guide (Kodi- TV / Timeline) there's still just a part of long EPG headers.