The <title> tag in the header of each html file can be used by devices/apps to display at the top of the page or something. They don't all use it. And some devices/apps can taylor what is displayed. I set the <title> to the title of the book rather than the title of the chapter.
You can use a regex to change that on all pages very easily.
search:
<title>\s*(.*?)\s*</title>
replace (select 'all HTML files' in Sigil):
<title>The Title of Your Book</title>
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