How do you import a view? I copied the JSON and tried pasting it, but that wasn't an option, so I tried saving it as a .json file and using File > Import... but that didn't work either...
If you shift-right-click on a view in the designer tree, you get additional JSON copy/paste options. Pasting completely replaces the view definition, so it is dangerous, and therefore requires an extra operation. (Similar to the raw XML options for Vision windows and templates.)
It's only replacing it locally though, you can always close and revert it'd be nice if this was made more obvious somehow, as people simply don't know this exists unless they stumble across a random forum post. Maybe it's in the user manual but I doubt it.. The doc writers probably don't even know about it
Now that I've been able to import the view, I see what you mean. There's clearly enough space available in the parent container. At first I thought it must be because you had OuterFlex set to a basis of 200px, but it behaves the same when set to auto.
If this is a bug in Ignition, it seems like one they wouldn't be able to fix without breaking existing views that were designed to work when it behaves the wrong way.