How do I set command and editor icons that appear in windows alt-tab?

I use windwos alt-tab to flip between open windows in Windows 10. I also work with the Matlab "command" undocked to be able to flip between command and editor and (as they are generated) figures. Until recently the editor and command window had different icons showing in the alt-tab strip: now they are the same (the orange Matlab icon) although figures retain a different icon. This is frustrating as I frequently re-open the wrong window after viewing a figure. Can I chose what icons appear here? NB I also revert to 'old style' alt-tab, which specifically uses icons, rather than a modern mini-version of the window (search for "how-bring-back-old-alt-tab-experience-windows-10" if this is not clear).

Searching for variations on "icon + editor" etc repeatedly focuses on an editor for desiging icons...

thanks in advance