Yesterday I had only 1 W-Fi bar, running Big Sur on new MBP 16in. I restarted computer and it was fine. To be fair, initially the MBP was connected to my main gateway which is a number of thick walls away, and not connected to the extender pod in that room. When I restarted the MBP it connected to the pod with full bars. I installed Big Sur on my iMac 2018 27in today and have full Wi-Fi bars.
Laura1
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