Currently tooltip goes out off the screen when the graph view (in line mode) presents a large number of groups. The present commit splits the tooltip content in three columns when the number of groups exceeds 20. This split is not done in mobile mode because it is not an appropriate in that situation. Co-authored-by: Mohammed Shekha <msh@openerp.com> Related to Task: 1917958 closes odoo/odoo#30288