Right Click on window header (slon Explorer or Tool Box) select Docable.... and Drag the window, you can see a small icons at 4 sides of your monitor. and drop the widow where you want to auto hide.
start from the menu "Tools"->"options"-> Environment->Fonts and Colors. then you can change the font style on the right table page. click OK. Your default font gets changed
After playing with solution explorer in Visual Studio 2008 I lost AutoHide feature on that window. when I right click on Solution explorer I see that AutoHide is disabled.
Answer: Two things you can try:
1. Window->ResetWindow Layout
2. Tools->Import and Export Settings... Reset All Settings (Whether you save the current settings or not is your choice).