suite/timesheet_description/views/timesheet_views.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <record id="view_task_form2_inherit" model="ir.ui.view">
        <field name="name">project.task.form.inherit</field>
        <field name="model">project.task</field>
        <field name="inherit_id" ref="hr_timesheet.view_task_form2_inherited" />
        <field name="arch" type="xml">
            <xpath expr="//field[@name='timesheet_ids']/tree" position="attributes">
                <attribute name="editable"/>
            </xpath>
            <xpath expr="//field[@name='timesheet_ids']/form//field[@name='name']" position="attributes">
              <attribute name="widget">text</attribute>
              <attribute name="placeholder">Describe your activity (you can use markdown)</attribute>
              <attribute name="colspan">4</attribute>
            </xpath>
        </field>
    </record>

    <record id="hr_timesheet_line_tree_inherit" model="ir.ui.view">
        <field name="name">account.analytic.line.tree.hr_timesheet.inherit</field>
        <field name="model">account.analytic.line</field>
        <field name="inherit_id" ref="hr_timesheet.hr_timesheet_line_tree" />
        <field name="arch" type="xml">
            <xpath expr="//tree" position="attributes">
                <attribute name="editable"/>
            </xpath>
        </field>
    </record>
</odoo>