Switching locations on the app if you're employed at different locations can be done in two ways:
When first entering the app.
When first entering the app you are most likely being greeted by this:
Afterwards you need to choose the locations you wish to see both earnings and future shifts from - and you're good to go!πβ
When being locked in to the app.
You need to press "you" down in the right corner:
When being on the "you" page - press "switch employer"
Then choose the location - and you're good to go! πβ