Resize image

Workspace. You mean the Viewer for the image in the Timeline?

Set the Spatial Conform for the image to the default Fit. The will make the image fit vertically in the space. Now it's more than half the size of the screen. What do you want to do with the left side of the image?

Once you have one image set the way you want, if you have to do more, you can use copy and the paste attributes function to duplicate it.

You mean a button? No. But with snapping and transform it show be a few seconds work.