I just keep some of my expansions in one group, along with some other triggers: that pallete is set to display a palette from a keyboard trigger for one action.
Then I pick the expansion by letter, in some cases even by a second letter. It sounds slow but once it is in muscle memory it is very fast, I forget sometimes that a palette is showing, since ironically since I set it up I have learnt some of the sequences of letters and the Keyboard Maestro response is pretty much instantaneous on my mac. In terms of time I don't find any difference between calling up the palette and then typing a single letter and some of the longer strings one always needs for expansions.
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But more seriously, what is it that you want to see? Just a list of triggers, or also their macro names or also their expansion values? A solution may depend on what you really want.
Yes, you got it, @peternlewis just showed me how to embed a regex search in an expansion too! In fact my system has both conflict and regular palettes in the same routine as it were. I call up the palette and some of the expansions will call up a conflict palette. A few of them, for historical reasons start with "a" for example. So that keystroke calls up a conflict palette. So really it is both types in my system. Does that make sense?
As I said I am barely aware of how it works now because I don't have time to look, it is just a sequence of keystrokes really from my point of view, like it say on the can Keyboard Maestro! However initially it is pretty smooth and you can see what the keystrokes are supposed to be. I would post it up but the expansions are best kept private I suppose.
You might find Brevis -- Automating Text Expansions helpful. It stores text expansions in one variable and, in addition to typed string triggers of several variants, provides a Control Panel to find them by category, whose list can also execute any of them with a click.
At the moment I have 45,895 text expansions in Typinator and a few in Keyboard Maestro that use KM's computational capabilities.
I'd go crazy if I had to manage them all in Keyboard Maestro, and here's my case for why Typinator is a very good synergistic tool to use with Keyboard Maestro:
Since my memory is not what it once was, and the number of expansions is ever growing... I make extensive use of Typinator's Quick Search function along with the ability to have specialized categories of expansions that only show up in Quick Search when a specific prefix is entered.
I've used this critter for somewhere around 12 years now and am quite happy with it.