Letter "m" doesn't work in vmware on another computer

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Hello guys!

If i am connected to my friends computer and we use vmware workstation on his computer ,its not possible to use letter "m"(in his Virtual machine) without getting an error about: cannot use multiple monitors... How to delete hotkey that "m" represents... Because its really not possible to use "m" key on keyboard on another VM. And why is letter "m" even binded while using another vmware.