Building custom solutions that extend, automate, and integrate Microsoft 365 apps.
You'll get better information with the correct terms. A default Microsoft presentation has 1 Slide Master and 11 Slide Layouts. In Slide Master view, the slide master is the larger thumbnail at the top of the list of thumbnails, while the slide layouts are the smaller thumbnails below.
If a slide is based on a slide layout, you cannot remove that layout. You can only remove unused layouts.
It's best and easiest to design a slide template that includes only the needed slide layouts, then distribute that to all users. You may be able to do this with a GPO.