ths page does not add to the menu.
in earlier times this was no problem But nowadays... i do not know what goes wrong here..
I do not understand how all the various menu options in WordPress work, and then each theme can also add to all of that. If you have made a page, it has been added to some menu somewhere and you will need to look at Dashboard > Appearance > Customize > Navigation (where I have selected "-- Select --" as my Primary Menu) and at Dashboard > Appearance > Menus to see what you have going on and to figure out how to get things to display as you want them.