@sdetweil I did a test with Google Chrome on a second machine. As far as I can tell I get the same response - that is on a return from GoogleAssistant it does not use my custom.css settings. Cntl-W has the same effect.
I do not know how to work with the developers window. I opened the window, and the elements tab was open. I could not find the classes after that. I really do not know how to use the developers window. Can you point me to a write-up or tutorial on using the developers window?
Thanks

@sdetweil Thanks! I will try this and report back

@Bugsounet Thanks again for your response. I did a quick test putting my modified .css code into main.css and the exact same behavior occurred. That is: displayed correctly when MM started, incorrectly when GA exits, and ^w corrects the display again. I am not sure where the issue occurs.
As you say, maybe @sdetweil has better insight.

@Bugsounet Thanks for the response. I am am using custom.css to place the default clock module on the screen. This custom.css file is not related to MMM-GoogleAssistant at all. My issue occurs when MMM-GoogleAssistant exits; then it returns to the MagicMirror screen but the clock is not placed correctly. When MMM-GoogleAssistant exits, it appears that ~/MagicMirror/css/main.css is executed, but my custom.css file is not executed.
However, if I then press cntl-w, then the screen resets correctly. I am wondering what commands/code are executed when MMM-GoogleAssistant exits? And can I change that?

I have MagicMirror2 installed on RPi4 with a PIR sensor.

MMM-Assistant2Display and MMM-GoogleAssistant are installed and working well. Thanks @bugsounet!

I added a ~/MagicMirror/css/custom.css file to locate one of my screen modules. That works well until I access Google Assistant.

On testing, I found that the custom.css file is not executed after accessing the GoogleAssistant and the module position is reset to a default.

Any help would be appreciated.