Full control of lovelace layout

I am looking for a way to “fill” the whole screen with my cards and it just doesn’t seem to be possible using default HA lovelace behaviour.
When I combine horizontal/vertical stack cards it just makes the existing card smaller and leaves these massive gaps on the side of the screen.


What do you guys suggest to use to correct this? I assume there must be something in HACs that can help.

Change the view mode to ‘panel’ and use stack or grid cards. Or use this:

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Just tried panel mode there and is not great it seems to ignore the vertical resolution of the screen (it just makes the height proportionate to the width) and you end up having to scroll.
Can you give it a height, doesn’t seem to have that option?