What are M S settings?
The m and s settings are settings determining size of medium and small images on the xz1. You are not likely to need to bother with them at all.
The other two posters are referring to two of the exposure modes , manual exposure and shutter priority.
'It is nice to be important but it is more important to be nice'
|Black on White by RaVN11|
|Hummingbird and Bee by dibilio57|
from A Big Year - birds
|xheneta iseni _for DPReview by Mike Slade|
from - My Fair Lady - (Portraits in Full Colours Only + A Border)