IPhone 6s Apps are not being shown in iTunes on Windows 10
If all you're wanting to do is clear space on your iPhone and you want to know how much space each app takes up, you can do this all directly from your iPhone as follows:


Go to Settings
Swipe up and tap on General
Tap on Storage &amp; iCloud Usage
Under the Storage heading (not the iCloud heading), tap on Manage Storage
Give your iPhone a little time to calculate how much space each of your apps is taking up
When finished they'll al be listed from largest to smallest


Now you can tap on any 3rd party app to see a breakdown of its data usage or to actually delete the app altogether.

In the case of Apple's iOS apps, tapping on them will give you various options depending on the app.