Hi Francois,
Not a dumb question, but sorry, there is no “tile” equivalent in ChimeraX currently.  If you don’t have too many structures, you could first superimpose them all in the middle, zoom out somewhat (“zoom” command) and then translate them individually up/down (y axis) and left/right (x axis) with the “move” command, but it would be a little tedious and require some trial and error as to spacing.  It may be useful to save/restore positions with the “view” command.

<http://rbvi.ucsf.edu/chimerax/docs/user/commands/zoom.html>
<http://rbvi.ucsf.edu/chimerax/docs/user/commands/move.html>
<http://rbvi.ucsf.edu/chimerax/docs/user/commands/view.html#name>

I hope this helps,
Elaine
-----
Elaine C. Meng, Ph.D.
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco

> On May 20, 2019, at 3:17 AM, françois SERRA <serra.francois@gmail.com> wrote:
>
> Hi,
> sorry for the stupid question, but I spent quite some time searching for it.
> Is there some alternative to the "tile" command in chimera X?
> thanks!
> great tool :)
> francois