You may find after updating to the latest version of Avaz (Avaz 4.0 onward) that it has loaded a different vocabulary (Pragmatic vocabulary) and a horizontal page scroll, as compared to the vertical page scroll in the previous versions.
The version of Avaz 4.1 introduces the Pragmatic vocabulary that is supported by horizontal scroll (left to right), instead of vertical scroll (up and down). However, when you update to Avaz 4.1, the update process automatically takes a backup of your existing vocabulary, which can be restored anytime.
When you restore the previous vocabulary, it would also restore the vertical page scroll. Here is how you can restore the previous vocabulary :
Tap Settings > Backup & Restore > Restore backup before Avaz 4.0
Click here to see How to reset to Avaz Pragmatic vocabulary.