No, there is no option to set a table to have fixed width. Even adding to the datagrid’s style-property:
table-layout: fixed;
does not fix the columns.
Next option I tried, also has no effect: set the width of each and every separate column. So in Studio Pro, select the column of the datagrid and set the width:
and do this for every column. Alas, does not help.
Third try: give the column a class and add this to your styling:
.fixedcolumn100px{
width:100px !important; //!important is necessary to prevent Mendix overwriting any other selector.
}