A user reported that the "Views" management option is not showing on his website.
Solution:
Guided that to enable the "Views" management screen, please go to WP Admin -> Toolset -> Settings -> General and select the option "Show both the legacy and Blocks interface and let me choose which to use for each item I build" for editing experience.
Problem:
Display different number of columns (Desktop, tablet, mobile) using view
Solution:
Please make sure you set Bootstrap loading option. You can load the bootstrap from the Toolset. For that you should activate the option:
=> Toolset => Settings => General tab => Bootstrap loading => Set bootstrap 3.