The <group> tag allows you to organize the form content. Placing <group> elements inside a <group> element creates a two-column layout inside the outer group. Group elements are advised to have a name attribute so that its easier for other modules to extend them.
We will use this to better organize our content. Let's change the <sheet> content of our form to match this:
<sheet> <group name="group_top"> <group name="group_left"> <field name="name" /> <field name="user_id" /> <field name="is_done" /> </group> <group name="group_right"> <field name="date_deadline" /> <field name="team_ids" widget="many2many_tags" /> <field name="active" readonly="1" /> </group> </group> </sheet>