I have recently lost a complete page of apps and folders of apps. I am not sure what I may have done to cause this problem, but I need to fix it. So please let me know how to correct whatever I can do myself. Thanks for your help.
iPhone X
Did you check, if the folder got somehow moved into the App Library?
Organize the Home Screen and App Library on your iPhone - Apple Support
...or you may have hidden a complete page. Tap and hold the dits at bottom of home page.
(same link)
... or you are running a Focus that omits that page.
App display
