Hello. My name is***** can help you with your question.
The size of the image that you can set the camera to does depend on certain settings. For example if you are in low light mode (that's the icon with the candle), you are only able to select size M. this is also true of the "specific scenes" mode, and some other modes. What will happen is if you are set on one of these modes and you try to select a different resolution for the image, it won't let you. However, if you are not set on one of these modes it will let you set the lower resolution image, but then if you change the mode it will switch to the resolution required for that mode. So even if you can set the image at S, if you then switch the mode to lowlight, it will automatically switch back to M
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