Resize of a group of pictures to original size

[Delicate]

Hi

I'm a user of PTE since one and a half year, so I'm sort of familiar with the software.

But now and then I'm stuck with some issues ...

Here is one:

Is there a way to make a multiple resize of pictures in slides to the original size (100%), without having to do this in each and every slide. I mean the procedure in "Objects and Animation" -> "Common" -> "Size/positions in pixels..." - and then klicking "Size", which force the picture to be of the original size.

By purpose I want some pictures to be larger (= original size) than the slide in a slideshow.

Thanks,

Jan