When the `s_nb_column_fixed` class is present on the row, it should not be possible to change the number of columns in the "Columns" option (the option is supposed to be hidden). However, since commit [1], this behavior is broken. It happened because the "Columns" option needs to always be displayed in order to display correctly the "Grid" option and this class was therefore ignored. This commit restores this class behavior by hiding only the widget changing the number of columns and not the complete "Columns" option, in order to still be able to toggle between the grid and the normal modes. [1]: https://github.com/odoo/odoo/commit/84d684d8bdf43d3db11defd8174dee44775085c2 task-3369847 closes odoo/odoo#127144 X-original-commit: 8148521f052268877f36947e0533843a25d17b83 Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>