Used to level up the skill of your viziers, increasing their strength and skills in the arena, Union War, campaign mode (boss fight), and in the frontier. Auto-study becomes available after five seats, and you may have up to ten.
The "Auto" button becomes available after expanding to five seats, with the maximum number of seats being ten. There will also be a "Team Vizier" button, which is how you select the team to be automatically deployed.
Team Vizier button
When you select the "Team Vizier" button, you can select the team to be automatically deployed.