A small update is rolling in the Google Play Store for Google Sheets that brings improved support for pivot tables. The new build is version 1.18.232.03 for those keeping score at home and should be hitting everyone this week. With the update, you can now expand and collapse pivot tables in the app. This a pretty big deal for those who use pivot tables as you no longer have to go into the web version of Sheets to do this activity.
While doing this on your Android phone can still be a bit tricky simply because of screen size, if you are using the Google Sheets app on a Chromebook, this will be hugely handy.