Weird black box when selecting

its been following me since last week, my friend asked me me to press insert and it’s still the same

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Maybe you accidentally changed the highlighted line color to black? You should check in Studio settings.

In studio, go to File > Settings > Studio, scroll down, and you can find a list of colors for the script editor. Look around at the color setting, and that may help you.

That’s an internal theme error. Try messing with the themes. If that doesn’t work, try re-installing studio.

Could that just be your Highlight Current line option?
Try changing that :

-- command bar
settings().Studio["Highlight Current Line"] = false