>>528742248
it's the "change zoom" button, which defaults to ` for whatever reason (that's the tilde key to be clear)
an actual UI will finally be added for firemodes in season 4, with an indicator of your current firing mode and your button to change it, along with a pop up when you do change it (or your zoom mode)
https://streamable.com/qcs1k3

>>528742734
bleurgh, i'll live without not having a shiny badge