Hide Page from Breadcrumbs
In the page editing window there is a meta box called Advanced Display Options, where there is a checkbox to "Hide Breadcrumb Navigation" and "Hide the Page Title".
Do not have both checked at the same time as this effects accessibility for screen readers and will be hard for them to tell where they are on your site. In most cases it is not recommended to use either of these options.
The Breadcrumb is the description of the location of the page in the hierarchy just under the menu (highlighted in blue in the below screenshot). The Page Title is the name of the page highlighted in Orange in the below screenshot.
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