A family of Microsoft word processing software products for creating web, email, and print documents.
Word and Excel have fundamentally different designs. They were created by totally separate programming teams.
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So, Excel has "tabs" (what you are calling "pages"), while Word DOES NOT. Period. They have different design asthetics that you have to adapt to.
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In the context of how Word is designed you can approximate what you want using Heading Styles and the "Navigation Pane". You apply the build in Heading Styles. These styles can be displayed in the "Navigation Pane". You can show all of the heading levels, or select which levels show in the Nav pane, to approximate the "tabs"/"pages" in Excel you could show only Heading 1 styles
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Here is example of showing all heading styles in Nav pane:
Here is same document with nav pane set to show only Heading level 1
There is also an "Outline" view that will show desired heading levels ie
Both in the Nav Pane and Outline view you can drag headings, and their associated text up and down in the document. Clicking on the heading in the nav pane will jump you to that part of the document. That is a reasoanble approximation of being able to click on a tab in Excel.
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If you are interested in learning more about that I can provide links to articles for you to read.