In extension to one of our previous blog, this blog would add more to maximize the real estate on entity forms as well.
If you want to hide the left navigation pane from any of entity form as shown in below screenshot follow below mentioned steps:
1. Click the Form Properties of respective entity form
2. Go to Display tab
3. Uncheck Show navigation items option
4. Then save and publish your changes
This will give you more real estate on any of your entity forms.
Hope this article helps!