Probably your Description column is too wide taking up all the space, and the other columns are (invisible) off to the right. It's tricky to resize the collumn if you can't select it's right border, though.
Try maximizing the window and see if that let's you see the next column. Shrink the graph column. Hide the sidebar. You can even grab the Description column and drag it to the left. All of those things will give you more space for your oversized Description column, and with any luck that will make it's right border appear. Then you can just grab that border and resize it.
If you can scroll horizontally (easy to do with a magic mouse), that seems to work pretty well, too - but I don't see an actual horizontal scroll ball that you can easily use with a normal mouse.
There should be an easier way to set all the columns back to default widths.
Thanks! You are right - column was too wide. But there was no "resize" icon when mouse on the edge.
To fix this I had to do this trick:
For sure that's not the way it should be
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