My .tmux.conf file

tmux.conf

# Set prefix to Ctrl-a
set-option -g prefix C-a
unbind C-a
bind-key C-a send-prefix

# Use Alt-arrow keys to switch panes
bind -n M-Left select-pane -L
bind -n M-Right select-pane -R
bind -n M-Up select-pane -U
bind -n M-Down select-pane -D

# Use Shift-arrow to switch windows
bind -n S-Left previous-window
bind -n S-Right next-window

# vi mode
set-window-option -g mode-keys vi

# Mouse mode
set -g mouse on

# Set easier window split keys
bind-key v split-window -h -c "#{pane_current_path}"
bind-key h split-window -v -c "#{pane_current_path}"
bind-key c new-window -c "#{pane_current_path}"

# Easier config reload
bind-key r source-file ~/.tmux.conf \; display-message "tmux.conf reloaded."

# Lots of history
set-option -g history-limit 10000

# Status bar settings
set-option -g status on
set-option -g status-interval 2
set-option -g status-right-length 50
set -g status-right "#([ -d /proc/sys/net/ipv4/conf/tun0 ] && echo \"$({ ip -4 -br a sh dev tun0 | awk {'print $3'} | cut -f1 -d/; } 2>/dev/null) 🬄 \")#{pane_width}x#{pane_height} 🬄 %a %Y-%m-%d %H:%M"

After the TERM setting, add this to .bashrc:

if command -v tmux>/dev/null; then
    [[ ! $TERM =~ screen ]] && [ -z $TMUX ] && exec tmux
fi

This will start tmux automatically when a terminal is created.

Added the pane dimensions to the right status bar settings to make things easier when determining dimensions to set for PTTY sessions, etc.

Added a decent history-limit setting and adjusted the status-right-length to something reasonable.

Added vi mode for easier selecting of text for large blocks.

Added code to change the background colour of panes that are not in focus, to better indicate what's currently in use.

Removed the lines for background colours as they didn't work, and added some config setup to keep the current path when splitting panes or creating new windows.

Updated the status bar to include some separators as well as the IP for a tun0 interface, i.e. VPN for TryHackMe, etc.