@peternlewis, many thanks for the new tools/Actions you have provided us with in KM8. Unfortunately, all of the new Prompt actions do NOT allow us to provide a Title for the Prompt, so that the user knows what the Prompt is for.
No because once there is a list showing then there is a selection, and the selection is displayed where the title goes and I don't want to break either of those or add more space for a title.
The problem is that the user is presented with a list that he/she may not clearly understand the purpose. This is particularly true when the PWL is presented only sometimes based on the data.
You are using the macOS Spotlight type prompt which always must start with the user typing something in to first generate the list to choose from. But the user has explicitly triggered the prompt, and can clearly understand what the list represents. This is not true with the KM PWL.
Since you are asking for both the KM title and the AppleScript titles to both be bigger, I'll bet you can do that by opening System Preferences, click on Display, click on Scaled, and move the scroll bar to a larger scale.
I didn't want to test it because I was worried about side effects on my Mac that I might have to work to undo.