It's difficult to see the pictures I'm taking because the image shows up so small.
I'm going to toss out a challenge to your assumption. Keep the image small.
If you're shooting RAW, then what you're seeing is the camera's processed version. You are probably likely to adjust the settings in Post-Pro, furthering the look of your final image from this preview anyway.
The size is enough for you to quickly judge your composition and move on.
I don't know Sony but on my Canon, there is a zoom button to quickly get to 100% to check focus.
Learn to use the histogram to check your exposure.
So, by having the image small, you can:
- See the histogram, ensuring a proper exposure was taken (one can actually be fooled into thinking that an underexposed shot is okay by a too-bright preview)
- See enough of the image to check composition
- Have a single button press to check focus
- Confirm any other setting you may have overlooked (ever set your ISO to 3200 for shooting at night, grab your camera the next morning, and forget to lower it? The info makes it easy to catch that mistake)
If, instead, you had the preview image taking the whole screen, then you'd be toggling through items in order to get to this information or you'd be trusting the preview image (which, like I said, you should never do).