It is possible, but it can be tricky, it depends on what exactly you want the result to be.
In the Cursor menu, there is a "Change size..." item that can be used to change the image formats in your cursor. But it will also change the canvas size and you probably want to keep that. You can do that by first setting the size to something smaller while keeping the method to Resample. And the you can resize back to 32 (or whatever the original size was) while setting the method to Crop.
Alternatively, you can select all frames and go to Image->More transformations->Transformation and play with that. You have to set the coordinates of the target rectangle in 0-1 range. In order to resize for example to 80%, the coordinates should be 0,0 0.8,0 0.8,0.8 and 0,0.8