If you want to see what keyboard layout you are currently using, or you would like to switch between different layouts with a single mouse click, add the Keyboard Indicator applet to the panel. To do so, right-click the empty space on the main panel, and select the Add to Panel... option from the pulldown menu.

You will be presented with a list of available applets. Scroll through the list (or start typing “keyboard” to the search field at the top of the window), select Keyboard Indicator, and click the Add button.

The applet appears immediately, displaying the shortened name of the country the current layout is associated with. To display the actual variant, hover the pointer over the applet icon.