I have a question here to be able to help. Do you want to limit user by region to view? Or do you want a default region to load and then allow user to select the region they want to view ?
Ok, I can think of a redirected dashboard for this case. Like a landing page taking input from user which region to view and then redirect and load dashboard based on input. But I am confused how would you limit a user to choose any region, considering the user is anonymous.
@deepa.singh do you still need help with this or were able to find a solution/workaround? If you were able to solve this could you share your solution with the community?
Also, to clarify, is there a reason to use different regions i.e. there is different data held in each region? My suggestion is to create a sort of homepage as its own dashboard where a user selects the region, and then use external navigation actions with parameters that pulls them to a new dashboard according to their selection.