Design View Option in Dreamweaver CC 2015 Disappeared

That was the new normal for Fluid Grid Layouts in the last versions of the program to feature them as an option. They have since been removed in CC2017.

They can get the Design View back by making a small modification...

Close all other files, open the Legacy Fluid Grid's css and add the X shown below:

/*

    Dreamweaver Fluid Grid Properties

    ----------------------------------

    dw-num-cols-mobile:     X 4;

    dw-num-cols-tablet:        8;

    dw-num-cols-desktop:    12;

    dw-gutter-percentage:    25;

=====================================

Then save and close the file.

Restart DW and they should have Design View from there on out on any files using that LFGL's .css file.