I have been using Filemaker for a very long time. I recently got the 2025 version. I created a new layout, and for the first time ever, I find that whilst the row scrolls horizontally, the header stays fixed (list view). Normally, I scroll across and both the header and the row move together. I guess this must be very basic, but never had this issue before. I cant see where to change it.

Are you sure it's a header, not a top navigation part?
https://help.claris.com/en/pro-help/content/layout-part-types.html

You can see here, as I scroll the row, the header stays fixed:

You haven't answered my question. Go into Layout mode and check the label of the blue part. Based on your description it will look like this:

or:

Double-click the "Top Navigation" label and change it to "Header".

Edited February 10Feb 10 by comment

Thanks so much. Thats it I never knew this before..or maybe its a newer feature. Support much appreciated.