Type name of command and Excalibur will show you results matchting your query. You can navigate with arrows to select command (or mouse), and press Enter/Return (or click) to execute it.
To search for command faster, it is possible to type first letters of command name, divided by space.
Some of the commands have a right arrow near the name. That means that command has a submenu, where user can customise its parameters.
To access submenu press Right Arrow or Enter/Return.