Here you can Configure As

Here’s how you configure a hidden-fields rule exactly as highlighted in the red boxes:
1. **Go to the Settings ▶ Hidden Fields** In your top‐bar menu, click **Settings**, then select the **Hidden Fields** tab.
2. **Create a new rule** Click the **CREATE** button (upper left, green button) to start a new Hidden-Fields record.
3. **Select your model** In the **Model** dropdown, pick the model you want to tweak (e.g. `sale.order`).
4. **Add the fields you want to hide** Click **Add a line** in the one2many list to insert each field: * In the **Field** column, choose the field (e.g. “Tags”, “Total”,"Active" “Terms and Conditions”, etc.).
5. **Check where to hide it** For each field line you just added, tick the appropriate checkbox: * **Hide in Filters** – removes it from the search‐filter dropdown * **Hide in Groups** – hides it when you group records by that field * **Hide in XLSX** – omits it from any exported spreadsheet
6. **Save** Once you’ve added all desired fields and checked their “hide” boxes, click **SAVE**. Now your chosen fields will be hidden in filters, group-by menus or in exported XLSX views according to the boxes you’ve checked.

After this you need to inherit sale.order for odoo addons you need to inherit like this an add dynamic.group.mixin
What You Do Inherit the original model (sale.order).
Include all the usual mixins (portal, mail.thread, mail.activity, utm) to keep built-in web, chatter, activity and campaign features intact.
Append your custom dynamic.group.mixin at the end—this is the piece that injects the grouping UI and logic.

Here Is the video link

▶️ Watch the demo video here