Place a snapshot into a new white created image with different resolution and display it in the Frame Buffer preview

if you can go back a little you can use sensor.set_windowing(roi) at 128x128 or maybe a bigger square.
In this case you will set sensor.set_framesize(sensor.QVGA) at 320x240.
You can try a square at 240x240 in this case.

It works perfectly, thank you for your patience and for helping us. Have a nice day!