ChimeraX only uses a dark theme if you have chosen to use a dark theme for your other applications system-wide.  So one solution would be to chose a light color scheme in your desktop settings. Another solution is to explicitly choose the light theme by starting ChimeraX with the "--color-scheme light" option.  The startup option should be added to the way you invoke ChimeraX, for example by editing the desktop shortcut or by making a (sh/bash/csh/zsh) alias.     -- Greg On 3/22/2025 6:08 AM, hytxnt123--- via ChimeraX-users wrote:

Hi, I just upgrade my chimeraX to v1.9 but I dont really fit in the dark theme. Can anyone help me to switch back to the white theme just like v1.8?