Cases > Page Layouts
Edit Page layout, on the top most you can find a button called ‘Layout Properties’. clicking on that will give you the ability to show/hide the send “Email Notification Checkbox”
Same way you can show/hide the “Case Assignment Checkbox” in Edit page.
Fyi, checkbox need to selected default means, need to select both Checkbox “Show on edit page” and “Select by default”.
if you select “Select by default” checkbox alone its not working.

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I am Sakthivel Madesh, a certified Salesforce Advanced Developer & Administrator working on Salesforce Technology since 2011. I am currently working in Techforce Services as Sr. Salesforce Developer. I have worked on multiple technologies Like PHP, Java, Salesforce, I am very passionate about Salesforce and to earn 15x Salesforce Certification. I love Trailhead for learning Salesforce Skill and Become a Trailhead 5x Ranger too. I Love to Learn & Share my Salesforce knowledge to Salesforce Learners/Beginner using My Blog and Salesforce Community.

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