you can't add blank pages on the home screen of your LG device, so there's no button to create them. to add a page on the home screen, you need to move an app shortcut, folder or widget. only then can you create a page. if you remove the last item from the page, the page will automatically disappear from the home screen.

Android 9 (LG UX 9.0)
Step 1:  Tap and hold an  App Shortcut
Step 2:  Drag the  shortcut  to the right to create a new page
  1. Tap and hold an App Shortcut
  2. Drag the shortcut to the right to create a new page

LG Instructions
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