"Allow multiple selection" not available in exposed filters I'm having trouble making some options appear as checkboxes in an exposed view form. 
The problem is that the "Allow multiple selection" option is not available in the filter.


How can i make it visible. "Allow multiple selection" option.
You can go for Better Exposed Filters module.


  The Better Exposed Filters module replaces the Views' default single-
  or multi-select boxes with radio buttons or checkboxes, respectively.
  Description fields and Select All/None links can be added to exposed
  filters to make for a better user experience.