Weird resizing effect in Kiosk mode

I’ve designed a simple dashboard intended to show on a small Raspberry Pi screen (800x480) in my kitchen. It runs in kiosk mode.

This is what the design screen looks like:

…and this is what shows up on the Pi. Note that the panels seem to be oversized, overlapping, and rendered left-to-right.

Help? Is grafana just not designed to go that small?

Nothing? Really? Bummer.