GitHub Web UI Preview `Show Diff` Checkbox (New Feature Feedback)

Good day GitHub. I’m wondering why in the new update, the preview changes will not be automatic anymore. For me, as I use the GitHub Web UI directly, that’s very important for me to always see the changes made. And with this new update, it’s really cumbersome to always check it whenever there are changes. So please, with the new update, have the option in our profile settings to select whether we want this enabled or not, so that it will not be cumbersome. Thanks.