tmux_popup_configuration.conf

# open popup session in the current path, so single key can open or close popup with ease
bind-key -n M-u if-shell -F '#{==:#{session_name},scratch}' {
    # Detach the client if the current session is "scratch"
    detach-client
} {
    # Check if a popup is already open to prevent multiple popups
    if-shell '[ -n "#{popup_pid}" ]' {
        display-message "Popup already open"
    } {
        # Capture the current path and display a popup to open or attach to "scratch" session
        display-popup -E -w 90% -h 90% -x C -y C "tmux new-session -A -s scratch -c '#{pane_current_path}'"
    }
}