Note: PDF Reader for iPhone offers users Three ways to remove bookmarks.
Approach 1- Delete from Bookmark View
1. Tap the “View B/O/T” icon on the navigation toolbar.
2. Tap to see all bookmarks.
3. Swipe left on the page taping “Delete” and the bookmark will immediately be removed from this page.
Approach 2- Delete Directly
1. Tap and hold on the page that you want to remove the bookmark from for two seconds.
2. Tap “Bookmark” to remove the bookmark that already on the page.
Approach 3- Delete from Menu Page:
1. Alternatively you can also tap on "more options icon" on the toolbar while you are at the page with the bookmark.
2. Tap again to remove the assigned bookmark.