I could not reproduce this behavior.  Are you sure you did not do a small Z-rotation after tiling?  That might explain the appearance.  I.e. first the models are laid out horizontally but then the whole view is rotated slightly clockwise.  I can't distinguish that visually from a stepped layout since the rotation is small.

Try untiling (undo) and retiling and making sure not to rotate anything afterward.  Or, if tiling does give a tilted row, although I can't reproduce it, maybe you could just Z-rotate the whole view slightly counterclockwise after tiling. Z-rotation is done with the same mousemode as XY rotation except with cursor in the periphery of the graphics window (the non-central area).

If you have an example for which you are willing to share data and where tiling definitely fails to lay out the row horizontally, you can use menu: Help... Report a Bug and attach the data needed to reproduce it, and include a short description.

I hope this helps,

Elaine

On Sep 30, 2021, at 5:21 AM, Pranav Shah via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:

Hi,
I want to create an image of multiple volumes that are tiled
horizontally. However, when I run the command "tile columns 6" the
volumes get arranged in a step-like manner (attached image). I do not
see this happen in chimera so I am wondering if this expected
behaviour in ChimeraX? I am on UCSF ChimeraX version: 1.2.5
(2021-05-24) on the M1 MacBookPro, MacOS 11.6.

Best,
Pranav