Hi,

You can categories your fields using the <group> tag in xml.

<group>
    <group string="Check Boxes">
        <field name="check1"/>
        <field name="check2"/>
        <field name="check3"/>
    </group>
    <group string="Text Fields" name="texts">
        <field name="taxt1">
        <field name="taxt2"/>
        <field name="taxt3"/>
    </group>
</group>

Now in the left side list all the checkbox fields and the right side contain the text fields.

Regards