For more information please see in reference image
I had similar issue where the Value column was way too narrow. I tried making the window as small as possible and then resizing, but that didn't help. However, what seemed to resolve the issue for me was to click Add Editor on Right button (near the upper right corner with the "+") when Info.plist is displayed. This added a second window showing Info.plist with the Value column expanded all the way to the right edge, I closed the left pane with the narrow column. Now, even after quitting or opening other projects, I get the Value column expanded all the way to the right edge.
I had the same problem too. I think this is a Xcode 12 bug. I solved this by:
I don't know how the problem is solved but it did.
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