make single-line mode the default
When people see multiple lines in a genome browser, they are now trained to assume that these are tracks corresponding to a given region in the genome. I'd make single-line mode the default so as not to confuse people, and then let the adventurous user who wants to maximize their use of vertical space switch to multi-line wrapping mode. I doubt it will happen often though, because these users will probably prefer to load up more tracks to fill the vertical.
We’ve decided to change this to the default, after surveying feedback from new users. Multi-line is now considered an “advanced” mode.
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It is now the default!