You could script this and loop over the columns while deleting Multiple Response column property
Names Default To Here(1);
dt = Current Data Table();
For Each({col_name}, dt << Get Column Names("String"),
show(Column(dt, col_name) << Get Property("Multiple Response"));
Column(dt, col_name) << Delete Property("Multiple Response");
);
You can also remove these by using Standardize Column Attributes (at least this worked for me):
1. Select all weirdly behaving columns
2. Open Standardize Column Attributes and delete Multiple Response column property
It might also be a good idea to contact JMP Support about this. This can be easily replicated (Using JMP16.2 Pro on Windows):
1. Create table with Character column with numeric values
2. Set Multiple Response Column property
3. Change data type to numeric and modeling type to nominal
4. Now you have Numeric column with Multiple Response set
5. Go back to the column menu and change Data type back to Character
6. Close column menu and reopen it. Multiple Response will be visible again
-Jarmo