Hi,

Try the following steps.

1- Activate developer mode.

2- Duplicate the "Brand Promotion Message" View

    - Navigate to Settings > Technical > User Interface > Views.

    - In the search bar, type Brand Promotion Message to find the view that you need to duplicate.

    - Select the Brand Promotion Message view from the list.3- Create a New View Based on the Original

      -With the "Brand Promotion Message" view open, click Duplicate.

       -Update the following fields:

                * View Name: Change it to something unique, like Custom Brand Promotion Message.

                * Key: Change it to something unique, like web.custom_brand_promotion_message.

                * Inherited View: Select Brand Promotion Message to ensure that your new view will inherit from the original.

4- Replace the Code in the Architecture

In the Architecture section of the duplicated view, replace the existing code with:

<xpath expr="//t[@t-name='web.brand_promotion_message']" position="replace">
    <div class="footer">
    </div>
</xpath>

This modification removes the "Powered by Odoo" mention while retaining the footer structure for your website.

5- Save and Apply

Solved forum :- https://www.odoo.com/sl_SI/forum/pomoc-1/how-do-i-turn-off-the-powered-by-odoo-text-in-the-footer-of-a-website-199187

Hope it helps

Hello,

• Enable debug mode. 
• Go to in Website go to site > HTML / CSS-editor
• click Edit HTML anyway
• Top left choose SCSS (CSS)

Add following code :

.o_brand_promotion {

    display: none !important;

}

Save this and you are done.