What is the command to switch the top state of the window?

I need to use a separate preview window to view pictures or documents, and often need a top window for better comparison
I found the post @Leo answered earlier through the forum

@toggle:If Set LISTERCMD=OnTopOn 
@if:Set LISTERCMD=OnTopOn 
Set LISTERCMD=OnTopOff
@if:else
Set LISTERCMD=OnTopOn

I made a button and tried clicking the button to switch the window to the top state, but it didn't work
I checked the official documentation provided by dopus again and found details about set listercmd, but there is no command set listercmd = ontopon.
Is it deleted in the laterst version?
In addition, I have prepared two png icons. How to display different icons according to the top state of the window?

AFAIK this has been removed in Opus 13.

You'll need to use a third party tool for this.

Here's one from Microsoft: PowerToys Always On Top utility for Windows | Microsoft Learn
(you'll need to install PowerToys for this, there are other cools things there, check it out)

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Directory Opus 13 - Detailed release notes
Removed Functionality
Removed options to make various Opus windows on-top. (With UI adjustments to help. For example, Preferences and Customize can be saved, cancelled or brought to the front via Lister titlebars without having to go back to their windows.)