Is your feature request related to a problem? Please describe.
I'm always frustrated when I switch currencies and it doesn't convert from the displayed to the new currency selected.

Describe the solution you'd like
Set a base currency for a trip. If different currencies are selected after that it should convert to make it easier to plan and see prices.

Describe alternatives you've considered
I've considered putting everything in one currency but unfortunately the place I'm traveling to uses a different currency. i.e. I am traveling from Japan to the Philippines and trying to figure out food prices and local stays but they are both in local currency so I have to convert those into my local currency to place it in the app.

Additional context
Add any other context or screenshots about the feature request here.