Go to Appearance >> Customize >> Basic Settings >> Hide Page titles
There’s also a really cool plugin that I like which is called Hide Title you may want to check out because it also lets you hide titles on a per page basis (being selective).
Note: the xml file I forgot should be the .json file format. Another one of their changes which normally imports usually been xml, but apparently the .json format is beginning to show up now as a method for export/import.
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