Hello,
In the Leo in 20 Minutes / Leo's main window section is this description:
Other tabs may also appear in the log pane:
How do you make the Completion tab appear in the log pane?
See
this page. But that's not a great explanation.
<Alt-x> takes you to the minibuffer. You can type the beginning of any command and then type the tab character to see the list of commands that starts with that prefix.
For example, <Alt-x>show<tab> will show you lots of possible commands in the completion tab. Now you could continue typing after the tab so see fewer choices. For example, typing (still in the minibuffer) color<tab> will show this:
show-color-names
show-color-settings
show-color-wheel
HTH.
Edward