If you are currently only assigned to one Region in MEX and need to be assigned to all, you can rectify this by following the steps below:
Navigate to Region Setup in Control Files
Scroll down to "Users" in the right hand side menu and find your name
Change your assigned region to "Default", which will give you access to all regions simultaneously.
This will allow you to see all regions, alternatively if you want to inspect a specific region you can follow the steps again but select the desired region instead of default.