Wrapping the menu was never allowed in SolpartMenu Pre DNN 4.7 and the new menu allows the total menu wrap but this was not part of the thinking when the default skin was designed. The reason for giving such small area to the menu in designing the skin was to follow Web 2.0 Navigation Trend which was to give minimum number of parent tabs. Wrap was never part of the skin design brief so that is why it does not look so good.

You may consider to take out the search and put in your content panes. that will give you bigger area for your menu items. 

Salar

This should be solved for DNN 4.9.2, but you will still get an extra line, the skin does not expand