How normal users is able to see tasks in InMyBasket?

Hi experts, 

We are using innovator 11 SP9. 

Currently, only administrator is able to see all tasks of other users in 'InBasket'. 

I need to change the configuration (authorization?) for normal users to see other users' tasks too in their 'InBasket'. 

But, I couldn't find a solution. 

Would you please help on this?

Thank you so much for your help. 

Joseph