RPi4 & TV Remote

I tried the nightly LibreELEC-RPi4.arm-11.0-nightly-20220218-29c7284.img

Very pleased to see that FF & rewind for MP4s was working but still no joy with getting the TV remote to control KODI (tried all suggestions I've been given previously) So I'm still in the position of the RPi3 works with the remote but not the RPi4

I can see the TV's light flickering as it receives the signal. Is there a way to see if the signal from the remote reached KODI on the RPi4 and if so what arrived there?

Thanks for those, I'll be reading thoroughly later but from my quick skim through I think I didn't explain properly. It looks as though the information you supplied relates to using an IR receiver on the Pi rather than what I'm doing with the RPi3 and want to do with the RPi4 which is use the TV remote through the TV & HDMI to control KODI.

I do have a mini wifi keyboard attached to the Pi which I use but my wife is allergic to it and will only use the TV remote. As I say - no problem with the RPi3 but the RPi4 will not co-operate.

Right off to read the wiki in detail.