Welcome to Manjaro!
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Please read this:
[HowTo] Provide System Information
and post some more information so we can see what’s really going on. Now we know the symptom of the disease, but we need some more probing to know where the origin lies… -
An
inxi --admin --verbosity=7 --filter --no-host --width
would be the minimum required information… (Personally Identifiable Information like serial numbers and MAC addresses will be filtered out by the above command) -
Disconnect the second monitor, reboot, log back in and provide the output to:
xrandr
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Connect the second monitor again and provide another
xrandr
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I sincerely hope there is a solution because this:
is always bad news!
P.S. Before you do anything else: Kernel 5.9 is EOL, so upgrade to 5.10 LTS is you have very new hardware or 5.4 LTS if you have older hardware.