You can give the "Homepage" a different name instead of "index" and name another page "index" so that it becomes the homepage.

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3 Sitemap > mark homepage > klick Properties

[x] Name of the created file: other page

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3 Sitemap > mark other page > klick Properties

[x] Name of the created file: index

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Theoretically, in step 3, select Sitemap, you can highlight the page and click on “Properties” at the top. In the following window, enter index in the “Page name” field and also change the name of the previous homepage to another name. But then it happens that the home page no longer has the house symbol...

Correction:

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3 Sitemap > mark homepage > klick Properties

[x] Name of the created file: other-page <--- Do not use spaces

Thanks Daniel & Franz-Josef.  Yes, that works, but as mentioned the 'old' home page still has the house symbol, and not the new one.   That's not really a problem. However, when launching the site the highlighted menu item in the navigation bar still reverts to the old Home page, althought the 'new' Home page is correctly displayed.

Read my post here, see

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Blog as home page

>> https://helpcenter.websitex5.com/de/post/259508 (marked blue)

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Maybe some of the ideas in this post can be used for your own website.