Many XFCE plugins are available via menu: setting : panel : items, from here panel items can be added and removed and configured.
To see available XFCE4 packages in the Debian repository sudo apt-cache search xfce4*.  
You can define your own custom shortcuts. Go to Settings > Window Manager > Keyboard (tab).
These are the XFCE Windows Manager Keyboard on 2023-09-25, these are the default settings:
| Action | Shortcut | |||
|---|---|---|---|---|
| Windows operation menu | Alt+Space | |||
| Up | Up | |||
| Down | Down | |||
| Left | Left | |||
| Right | Right | |||
| Cancel | Escape | |||
| Cycle windows | Alt+Tab | |||
| Cycle windows (Reverse) | Shift+Alt+Tab | |||
| Switch window for same application | Super+Tab | |||
| Switch application | not assigned | |||
| Close window | Alt+F4 | |||
| Maximise window horizontally | not assigned | |||
| Maximise window vertically | not assigned | |||
| Maximise window | Alt+F10 | |||
| Hide Window | Alt+F9 | |||
| Move Window | Alt+F7 | |||
| Resize window | Alt+F8 | |||
| Shade window | not assigned | |||
| Stick window | Alt+F6 | |||
| Raise window | Shift+Alt+Page Up | |||
| Lower window | Shift+Alt+Page Down | |||
| Raise or Lower Window | not assigned | |||
| Fill window | not assigned | |||
| Fill window horizontally | not assigned | |||
| Fill window vertically | not assigned | |||
| Toggle above | Alt+F12 | |||
| Toggle Fullscreen | Alt+F11 | |||
| Move window to lower monitor | not assigned | |||
| Move window to left monitor | not assigned | |||
| Move window to right monitor | not assigned | |||
| Move window to upper monitor | not assigned | |||
| Move window to upper workspace | not assigned | |||
| Move window to bottom workspace | not assigned | |||
| Move window to left workspace | not assigned | |||
| Move window to right workspace | not assigned | |||
| Move window to previous workspace | Ctrl+Alt+Home | |||
| Move window to next workspace | Ctrl+Alt+End | |||
| Move window to workspace 1 | Ctrl+Alt+KP 1 | |||
| Move window to workspace 2 | Ctrl+Alt+KP 2 | |||
| Move window to workspace 3 | Ctrl+Alt+KP 3 | |||
| Move window to workspace 4 | Ctrl+Alt+KP 4 | |||
| Move window to workspace 5 | Ctrl+Alt+KP 5 | |||
| Move window to workspace 6 | Ctrl+Alt+KP 6 | |||
| Move window to workspace 7 | Ctrl+Alt+KP 7 | |||
| Move window to workspace 8 | Ctrl+Alt+KP 8 | |||
| Move window to workspace 9 | Ctrl+Alt+KP 9 | |||
| Move window to workspace 10 | not assigned | |||
| Move window to workspace 11 | not assigned | |||
| Move window to workspace 12 | not assigned | |||
| Tile window to the | Super+Down (keypad) | |||
| Tile window to the | Super+Up (keypad) | |||
| Tile window to the | Super+Left (keypad) | |||
| Tile window to the | Super+Right (keypad) | |||
| Tile window to the | Super+Home (keypad) | |||
| Tile window to the | Super+Page Up (keypad) | |||
| Tile window to the | Super+End (keypad) | |||
| Tile window to the | Super+Next (keypad) | |||
| Show desktop | Ctrl+Alt+D | |||
| Upper workspace | Ctrl+Alt+Up | |||
| Bottom workspace | Ctrl+Alt+Down | |||
| Left workspace | Ctrl+Alt+Left | |||
| Right workspace | Ctrl+Alt+Right | |||
| Previous workspace | not assigned | |||
| Next workspace | not assigned | |||
| Workspace 1 | Ctrl+F1 | |||
| Workspace 2 | Ctrl+F2 | |||
| Workspace 3 | Ctrl+F3 | |||
| Workspace 4 | Ctrl+F4 | |||
| Workspace 5 | Ctrl+F5 | |||
| Workspace 6 | Ctrl+F6 | |||
| Workspace 7 | Ctrl+F7 | |||
| Workspace 8 | Ctrl+F8 | |||
| Workspace 9 | Ctrl+F9 | |||
| Workspace 10 | Ctrl+F10 | |||
| Workspace 11 | Ctrl+F11 | |||
| Workspace 12 | Ctrl+F12 | |||
| Add Workspace | Alt+Insert | |||
| Add adjacent workspace | not assigned | |||
| Delete last workspace | Alt+Delete | |||
| Delete active workspace | not assigned | |||
Where:
| Action | Shortcut | 
|---|---|
| Virtual Terminal 1 | Ctrl+Alt+F1 | 
| Virtual Terminal 2 | Ctrl+Alt+F2 | 
| Virtual Terminal 3 | Ctrl+Alt+F3 | 
| Virtual Terminal 4 | Ctrl+Alt+F4 | 
| Virtual Terminal 5 | Ctrl+Alt+F5 | 
| Virtual Terminal 6 | Ctrl+Alt+F6 | 
| Virtual Terminal 7 GUI | Ctrl+Alt+F7 | 
Debian Documentation