Right click on the object like which your other objects should looks like and choose properties.
Layout tab -> Click on Theme maker button -> A wizard will open -> Choose new theme and provide name to ur theme and save it in a path -> click next next by selecting the required properties -> click on Finish button.
Then to apply the created theme,
Right click on the object to want to apply the theme, choose properties,
Layout Tab -> Click on Apply Theme button -> Pop up opens -> choose ur theme file and click ok.
For sheets the theme buttons will be available under General tab.
There is another option... we have a product called QlikStyle which is a template that you can use across all your QlikView applications that gives a standard look and feel to them all. It allows you to create one or more themes that users can select between. In addition to that there are configurable menus, custom tabs, additional security options and multi language support.
