Even the thingworx's help says layout is responsive and the Columns and rows have both responsive widths and heights. But in our case both columns and rows are behaving differently according to screen resolution and browsers(Chrome, Firefox)
The Layout Widget is a responsive container that allows you to separate a responsive container into sections.
Layouts can be placed inside the responsive containers of other layouts to create more even sections.
The Header and Footer have constant heights with responsive widths, while the sidebars have a constant width and responsive heights.
The Columns and rows have both responsive widths and heights, but you can change the percent of available space they will occupy relative to the space not being occupied by headers, footers, and sidebars.