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I'm using Mac OS X lion. In Finder, I use the column view. I know how to set up the width, but the thin line you use to drag the columns has suddenly become thicker and very visible.

I know this isn't a huge problem, but I don't know how it happened and don't know how to change it back.

I hope you know what I mean and how to get it back to default.

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Is it just the track for the scroll bars, or did you change the setting for showing scroll bars in System Preferences? If not, can you post a screenshot? – user495470 Jun 29 '12 at 0:30
It's the thin line you drag to adjust the width. I just checked in the system preferences and I fixed it! I pressed -> System prefrences -> appereance -> show scroll bars: when scrolling. So suddenly, this changed the appearance of the column lines. Thank you for your comment, I fixed it now. – Erwin Jun 29 '12 at 21:03

On Mac OS X 10.8 go to System Preferences -> General -> Show scroll bars and select "Automatically...". You probably had it set to "Always".

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