advanced-camera-card/docs/configuration/grid-layout-algorithm.md

Grid Layout Algorithm

When display mode (in live or media_viewer views) is set to grid, it will lay out cameras roughly in the order they are specified in the config (items may be moved to optimize grid 'density').

The following algorithm is used to calculate the number of columns. This attempts to offers a balance between configurability, reasonable display in a typical Lovelace card width and reasonable display in a typical fullscreen display.

• Use grid_columns if specified.
• Otherwise, use the largest number of columns in the range [2 - grid_max_columns] that will fit at least a 600px column width.
• Otherwise, use the largest number of columns in the range [2 - grid_max_columns] that will fit at least a 190px column width.
• Otherwise, there will be 1 column only.