Remove horizontal white margin lines at regular intervals

I'm running RStudio Version 2022.12.0+353 (2022.12.0+353) on macOS 13.0.1 (22A400).
I now have horizontal white lines (screenshot) at regular intervals (probably after updating R Studio).

I can't find an option to remove them. I tried global options -> Code -> Display but that's only for the vertical margin line.

Could anyone help me remove these?

separators (attached screenshot)

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