Hi, @BethRomero Thank you for your reply.
I'm using ArcGIS Online and Chrome. I see the updates in the edit window, but it doesn't show in the configuration preview.
I have tried editing both the source HTML and the text editor.
After I edit and close the text window, the app updates the draft's last saved date, and time won't update for the introduction panel; Then, if I open the edit window again, my edits are still there.
It happens only on the introduction panel. Because, If I select or unselect layers for the result option, the draft last saved date and time changes.
I have asked my colleague to try updating it, but he saw the same issue.