For those using iOS devices and find that their icons / bookmarks disappear or end up looking like targets on your home screen, the solution below works.

A more simple method is to swich to bold text and then back to normal text in - general - accessibility section of settings. Your phone will do a partial restart but only takes a few seconds. This causes the system to do a screen refresh similar to the language change method but a lot quicker.

by ctethompson via Apple Discussions

Another technique is to change out your language setting. I went from English to English (UK) and I got them back! Some other have used Japanese or Deutsch but getting back to English (US) could be difficult if you don't remember where the setting was or read that language. Good luck and happy swiping.