Apologies for the inconvenience, and thank you for your detailed feedback.
Please note that when the popup is active, interaction with other elements such as menu items or buttons becomes restricted. This is expected behavior, as the Popup Builder is not designed to allow interaction with the background content while the popup is open—you must close the popup to resume interaction.
Regarding the visible text #sp-pagebuilder-overlay-26, this appears when the popup overlay is disabled. This is indeed a bug. I have reported the issue to our development team, and it will be addressed in a future update.
We appreciate your patience and understanding. Please let us know if you need any further assistance.