right now I see my errors (eslint errors for example) only on the right side, which I find pretty hard to see on smaller screens. Is there any way / setting to highlight the line number on the left side when the line has an error?
How it is right now (notice the tiny red square on the right side):

What I would like to see:

Error Lens acheives your goal: making the error visually recognizable on smaller screens.
While it won't display the error just on the left side, but actually on the entire row - I'd argue it's actually even better for what you're looking for, because it even colors the minimap on the right :)
Here's how it looks:

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