In 2021.24.x, there should be two different camera icons. The icon you are referring to is for the rear cameras. If you look at the top left in the image shown below, you can see there is a Dashcam icon circled in yellow. You should be able to tap the button on the dock to show the other available icons and hopefully you'll see the Dashcam icon there. (FYI, you can drag desired buttons down to the lower bar so that they are always visible.)
If it's not there yet, then you might need to wait for another firmware update.
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