Measuring in fractions
The introduction of Container Grids brought a new unit of measurement called fractions (FR). Fraction represents the amount of space taken by a column or row as measured by the percentage of overall space it takes up. For instance, a fraction setting of two means the column(s) will take up 50% of the available space. This means that if you’re using the default measurements, 2FR means you’ll have two columns, 3FR three columns etc.
Rows and FR
If you try to drag more widgets into a Grid than there are cells, a new row will be created. The new row will be given a minimal height without impacting the row above it even if they’re measured in fractions.