MusicXML File From Finae Notepad Makes Page Formatting Weird?

Here is a fixed file. I want to Layout -> Page settings and changed the margins. Then to Style > General > Page and change the distance between system.

Indeed, Finale Notepad barely compares to MuseScore at all. A more apt comparison might be "MuseScore is a much better price for such full-featured software" (compared to Finale itself). ;-)

So, for one thing that's apparently not entirely a valid MusicXML file, as the error message upon opening it says, but if you load the file regardless it does work. What's going on is that, in Finale Notepad, the score was laid out in a specific way, with line breaks at specific measures and page breaks after a certain number of lines. When exported to MusicXML, the information about where the lines and pages break is preserved. By default, when MuseScore imports a MusicXML file, it will import those line and page breaks, too. If you look at, for example, the top right corner of the second page, you'll see the page break. You can click on it and hit Delete. (For more details on this, see https://musescore.org/en/handbook/breaks-and-spacers.)

However, it might be a better option for you to simply import the file without trying to force line and page breaks at the same points as they appeared in Finale Notepad. To do this, open MuseScore's Preferences, go the Import tab, and uncheck the box for "Import system and page breaks" (see attached screenshot).
Try changing that setting and reopening the XML file.

By the way, welcome aboard!