I use Hardwired theme for my galleries.
I can't find where i must change something to see the Film Strip under the "big image" to dispay only on one row....
hardwired is a very narrow theme that works with fixed table cell widths, so this is by design: either reduce the width of your thumbnails or use less thumbs per film strip (or use another theme). There's no other fix, sorry.
Joachim
Thank you for your quick answer !
I have changed the numbers of thumbs....