How to Customize Child Theme
Possible Answers to Your Question:
1. Spacing may be adjusted in the widget under the Advanced option on the Design Bar.
2. Which demo are you referring to? There is no native gallery in Layers so just be sure you are not using a Child Theme from Themeforest (which has its own support and documentation )
3. It sounds like you are using a special Child Theme for Layers. First check the theme’s page on Themeforest to see if the author provides their own support and documentation. If using Acquire. Lace Sole , Coffee, Play or Classroom, please use the dedicated support here so we can be sure you get a prompt reply: