Hi there,
Thanks for raising up the question~
After saving your changes on the form, please click 'Publish to SharePoint' button, then click the button with same name on the pop-up window.
A screenshot is uploaded to show the two buttons.

You may need to sign-out, clear browser history, and then sign-in again to reflect changes in a new session.
Please feel free to reply the topic if the issue persists.
Thank you and have a nice day.