With the additional buttons there is simply not enough place in the current Outline skins to display all buttons and text in one row.
So the library frame breaks from the defined dimensions (in skin.xml).
I think it would be ok to put the buttons + the help text in 2 rows as there will be more buttons anyway in the the near future, e.g. for custom transition time https://bugs.launchpad.net/mixxx/+bug/729640
With the additional buttons there is simply not enough place in the current Outline skins to display all buttons and text in one row.
So the library frame breaks from the defined dimensions (in skin.xml).
I think it would be ok to put the buttons + the help text in 2 rows as there will be more buttons anyway in the the near future, e.g. for custom transition time https:/ /bugs.launchpad .net/mixxx/ +bug/729640