ALLEXCEPT Removes all context filters in the table except filters that have been applied to the specified columns.
Syntax
ALLEXCEPT(table,column[,column[,…]])
Parameters
Table – The table over which all context filters are removed, except filters on those columns that are specified in subsequent arguments.
Column – The column for which context filters must be preserved.
Return Value
A table with all filters removed except for the filters on the specified columns.
Reference Data
https://docs.microsoft.com/en-us/dax/dax-function-reference