(iMovie) photos with audio -How to display entire photos?

[macstatic]

I have an audio recording which I want to present as a movie along with some scans of related documentation. The different images should change to where it's relevant the the audio.

Both the audio (MP3) and scanned images (JPG) import fine into iMovie, and I've even added some of the images alongside the audio and extended their lengths accordingly and added transitions between them. My problem is that only a portion of the images are shown. It seems that iMovie "detects" that one of them containing a photo should zoom in on the photo while doing a Ken Burns effect, and another scanned image containing text automatically scrolls from top to bottom. Very nice, but not what I inteded. Is there a way to display the images in full or have some more control over where they zoom into/scroll etc.?
Another thing: is it possible to insert empty spaces in between photos (i.e. just a completely black background)? Would I have to place an actual black image file in there, or is it possible to do without?

I'm using iMovie 10.1.12 in MacOS Mojave 10.14.6.

 

[macstatic]

I believe I figured it out myself!
For selecting the entire photos (or specific parts of them, or a Ken Burns movement from one part of the photo to another) you need to:
1) click once on the image in the timeline to select it
2) click on the "Crop" tool above the preview window
3) select the "style" (Fit, crop to fill, Ken Burns) depending on how you want the photo to be shown.

My other question on how to insert an "empty space" in between photos (a black background): there is indeed a way to do this in iMovie itself. Just click on "Backgrounds" and drag the "Black" background to wherever you want it in the timeline.