Microsoft has confirmed that Start Menu will be resizable when Windows 10 releases later this year. In the first Windows 10 Technical Preview Build, Microsoft allowed users to resize the Start Menu according to their needs. But in the later builds, Start Menu only had two sizes, either full screen or a compact one. But Gabriel Aul from Windows team has confirmed on Twitter that resizable Start menu will be part of Windows 10 when it releases later this year.
@Vlad2989 Yes 🙂
— Gabriel Aul (@GabeAul) April 7, 2015