How can I resize the icons in the dock(s)?

[antonhinneck]

I have the same regarding the main dock. Is there some theme file that can be modified to change the icon size? There must be an option because of the icon animation: When the cursor hovers over them their size increases. There must be a property like IconSize that can be modified permanently.

Using dconf-editor solved it:

Plank configuration file

dconf doesn’t show much. There use to be a settings file for Plank. My point is, where are the Plank Preference changes stored to persist over restarts?