only current session is showing on the status bar.

[YousefHadder]

As seen in the screenshot, I have 2 sessions opened, but only the current one is showing in the status bar, while in the show off tmux configs page, I saw multiple sessions showing in the status bar.

My tmux.conf file:

set -g @battery_backend 'sysfs'

### Plugin: https://github.com/tmux-plugins/tmux-yank
set-option -g @yank_selection_mouse 'primary'  # clipboard', 'primary' or 'secondary'
set-option -g @yank_action 'copy-pipe'         # or 'copy-pipe-and-cancel'

### Plugin: https://github.com/catppuccin/tmux
set-option -g @catppuccin_flavor 'mocha'
set-option -g @catppuccin_window_status_style 'rounded'
set-option -g @catppuccin_window_number_position 'right'
set-option -g @catppuccin_window_flags 'no'
set-option -g @catppuccin_window_text '#W'
#set-option -g @catppuccin_window_text_color '#{E:@thm_surface_1}'
set-option -g @catppuccin_window_current_text '#W'
set-option -g @catppuccin_window_current_text_color '#{E:@thm_surface_2}'
set-option -g @catppuccin_date_time_text '%d.%m. %H:%M'
set-option -g @catppuccin_status_module_text_bg '#{E:@thm_mantle}'
set-option -g @catppuccin_status_middle_separator '▐'

# source the plugin here
set-option -g '@catppuccin_battery_color' '#{E:@thm_lavender}'
run '#{TMUX_PLUGIN_MANAGER_PATH}/tmux/catppuccin.tmux'

# load custom moudules
source -F '#{d:current_file}/custom_modules/ctp_cpu.conf'
source -F '#{d:current_file}/custom_modules/ctp_battery.conf'
source -F '#{d:current_file}/custom_modules/ctp_memory.conf'
source -F '#{d:current_file}/custom_modules/primary_ip.conf'

set-option -g allow-rename off
set-option -g status-position top
set-option -g status-interval 5
set-option -g status-left-length 100
set-option -g status-right-length 100
set-option -g status-left '#{E:@catppuccin_status_session}'
set-option -gF status-right '#{E:@catppuccin_status_primary_ip}'
set-option -agF status-right '#{E:@catppuccin_status_ctp_cpu}'
set-option -agF status-right '#{E:@catppuccin_status_ctp_memory}'
if 'test -r /sys/class/power_supply/BAT*' {
  set -agF status-right '#{E:@catppuccin_status_ctp_battery}'
}
set-option -ag status-right '#{E:@catppuccin_status_date_time}'

# start index at 1
set-option -g base-index 1
set-option -g pane-base-index 1

# renumber when window is closed
set-option -g renumber-windows on

# enable 256-colors
set-option -ag terminal-overrides ',xterm-256color*:RGB'

### keybindings

# prefix + h - split window horizontal in current directory
bind-key -T prefix 'h' split-window -h -c '#{pane_current_path}'

# prefix + v - split window vertical in current directory
bind-key -T prefix 'v' split-window -v -c '#{pane_current_path}'

# initialize tmux plugin manager and source all plugins
run '#{TMUX_PLUGIN_MANAGER_PATH}/tpm/tpm'

[kjnsn]

Only one session is on the status bar in the screenshot. The status bar is one line only (unless configured otherwise, but that is not the case).

It's likely something like https://github.com/junegunn/fzf/wiki/examples#tmux

But would be very trivial to add a new status line for every session if you really really wanted I guess