My answer in an enhancement of Pedo so instead of searching for the div name which will rremove the about section but keeps the title "About".... You should look for the About id name like this:

id="res_config_settings_view_form_about" model="ir.ui.view">
    name="name">res.config.settings.view.form.inherit.about
    name="model">res.config.settings
    name="inherit_id" ref="base_setup.res_config_settings_view_form"/>
    name="arch" type="xml">
        expr="//div[@id='about']" position="replace">
        
    

Hi,

Go to Settings and activate developer mode. Then go to Settings -> Technical -> Views

Under the tree view of Views, find the one with view name 'res.config.settings.view.form.inherit.base.setup'. It should most likely be the first one.

Open that view and delete the mentioned code segment in the below screenshot.

And save it manually if required. This will remove the about section under general settings.

If you wish to reset the view in future, you can see compare/reset option in the action menu.

Regards