- Official Post
You missed to provide further infos...
1st guess from my side:
The "computer" you are talking about is a laptop?!
2nd guess:
You are using the HMDI out of your Laptop (if the 1st guess is correct) and therefore you have some kind of dual screen setup now. LibreELEC doesn't support dual screen setups. Normally you have the possibility to switch monitor output behaviour on your Laptop while using the FN-keys and you should have the following options:
- extended: means the screen is extended over 2 monitors
- internal: only the internal laptop monitor is in use
- external: only the external monitor is in use
- mirrored: both monitors will show the same thing
3rd guess:
I guess you have "mirrored" enabled and the resolution from your laptop screen doesn't match the resolution the TV might be capable of. So the HDMI out is limited to what the laptop screen is capable of which could result Kodi being displayed in the upper left corner. This can't be configured as LibreELEC doesn't support multi-monitor setups.
Solution suggestions:
Try to switch the monitor output behaviour using the FN-keys until you will see Kodi in full screen.
If you don't have those FN-keys on your laptop (as you missed to tell the exact model you are using), you can try to ssh into LibreELEC and get us the output of: xrandr | pastebinit
You will get an URL after entering the command above which should be posted here. That will show us which monitors are connected, in use and which resolution they are capable of. Then we can tweak something using some commands.