These match keywords anywhere in what you type (e.g. "AM AL" still picks up the AL colour, "PM WFH" picks up the WFH colour).
This overwrites existing entries for the selected staff & days in the open month.
Off / AL / MC days are excluded from the ratio. Anything containing "WFH" counts as WFH; remaining worked shifts (AM, PM, Wkend, etc.) count as WIO.