I'm not sure what the deal is, but the current beta is showing these really obnoxious indicators at the bottom left and right corners of the screen. They appear for a few seconds and then vanish each time you navigate back to the home screen. They don't appear on screen captures so I can't include them as an attachment here. Anyway they are quite useless and annoying, and they need to be removed in the official version please.
For anyone using full-screen gestures for the first time, those indicators may linger for a while as a reminder where to swipe for your Google Assistant, but they do disappear after a short time and do not return...
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If you are referring to the 2 curved indicators at the bottom left and right of the screen, those are the swipe indicators for Google Assistant when you have full-screen gestures enabled. They remain onscreen for a while to serve as a reminder (and they may display a mesage/hint as well) and then disappear thereafter...
