Toggle Applications Palette: Opening windows

I use the Toggle Applications Palette which KM provides. It may be a function of my OS, Tahoe or part of the applications. I must press Options before opening the application I want to open. Otherwise, all other applications will be hidden. Recently, on a Zoom call, I wanted to show multiple windows, but I was unable to show an application in the palette. I want to make sure this is not a function of KM before I get involved with an almost certain futile attempt to get support from Zoom.

Do you mean the Application Switcher? The "Activate Application Switcher" Action has an option to "Hide other applications when switching" and it sounds like you've accidentally turned that on:

Turn it off again and you should be sorted.