Hi Thierry,
Thank you very much for all the details.
The columns count is calculated from the given result width, and depends on the container width as well. You can however specify a % value as a width, so that way the columns count will be static.
For example, using 25% as the column width will display 4 colums automatically: https://i.imgur.com/YiLnXwY.png
You can also set the margin on the same panel there: https://i.imgur.com/nnATnjk.png
