Make preview size for PowerPoint same as other worship items (lyrics, Google Slides)

(This is a pretty minor issue, but I have been looking for a solution nevertheless.)

When we use PowerPoint slides in our services, the preview sizes (the "thumbnails") for the slide pages are a lot bigger compared to the other worship items.

So even if I set the "zoom level" to show 4 pages per row, when we get to the PPT slides, they are so big that it only fits 2 pages per row.

I can use the "zoom" slider on the bottom to change the preview size, but then that also affects the other non-PPT slides and makes them even smaller.

Is it possible to make the sizes for PPT slide previews more similar to the other slide types? (Same width at least?)

We dont use PowerPoint media often but a visiting minister has provided a pptx with slides he'd like to use in our service. Imported the file ok and then noticed the same issue as above with the preview sizes differing drastically.

By default, slides in presentations that you create from the Blank Presentation template are set to Widescreen size. To change the size of your presentation slides, on the Design tab, in the Customize group, click the Slide Size button and then choose one of the pre-defined sizes.

I'm sorry Tony, but what you are writing has nothing to do with the issue I was talking about.
I am talking about the (pixel) size of the preview thumbnails.

Example: Song lyrics are this size:
https://cdn.imgchest.com/files/4apc5pk5934.png

But when we have a Powerpoint, they are this size:
https://cdn.imgchest.com/files/7mmc96l99w7.png

We can of course adjust the slider on the bottom to change the size, but when we change it on the Powerpoint, it also changes the song lyrics into tiny boxes. Which is not necessarily a *huge* problem either, but it would really be great if the size (in pixels) is the same for the Powerpoint thumbnails and the thumbnails for the other service items in Presenter.