This is a problem with Windows 10 in general - vast areas of empty white space on a PC because it has a widescreen monitor which a mobile phone doesn't. Metro tiles which may make sense for a touch device but are just awful for a PC. Calling everything "apps" instead of programs (a bugbear of mine). And IMHO a terrible visual refresh that sucks all the colour out of the icons and replaces them with monochrome line art (icons are white-on-blue or white-on-red or white-on-green, settings screen icons are blue-on-white or blue-on-grey, etc.)
How anyone can call this an improvement on windows 7's UI I don't know.