If you wish to do it in another proper way, here is a workaround for it
- Go to SharePoint Designer
- Open the Site
- Open the list where you need to do the changes
- Add a new Edit form to it
- Set the new Edit form as default
It is not required to do any modifications in the newly created Edit Form unless you wish to personalize it. By default the ‘Approve’ & ‘Reject’ button will not be shown in the Edit Form and you will be getting only ‘Save’ & ‘Cancel’ button.