/usr/share/byobu/keybindings/mouse.tmux.enable is in byobu 5.87-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | set -g mouse-resize-pane on
set -g mouse-select-pane on
set -g mouse-select-window on
set -g mode-mouse on
set -g mouse-utf8 off
bind-key -n M-F12 source $BYOBU_PREFIX/share/byobu/keybindings/mouse.tmux.disable \; display-message "Mouse: ON"
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