In Mojave, and it’s pretty similar across versions IIRC: open keyboard preferences in system settings and check the “Show keyboard and emoji viewers in menu bar” box.
That will replace the language flag icon in your top bar with an odd icon with the command key embedded.
The second option in that menu is the keyboard viewer. You can show that and drag on a corner to make it as large as you want. Dynamically changes the keyboard as you hold down modifier keys.
That will replace the language flag icon in your top bar with an odd icon with the command key embedded.
The second option in that menu is the keyboard viewer. You can show that and drag on a corner to make it as large as you want. Dynamically changes the keyboard as you hold down modifier keys.