Customize button id=kt_app_layout_builder_toggle
Is this button available to use in template after I buy? If so, how do I put in project?
This button is available here
but is not available to me in my purchased template.
The customize button is available only for the preview. But you can copy-paste the theme customization drawer from the online preview and add it to your template(along with other drawers at the bottom of the template) and the layout part of it should work as expected. However, the functionality of the customizable options will not work on your end since it's implemented in our backend for demo purposes only.
If you need any further clarification please do let us know.
However, is there something that you could recommend concerning that dynamic switching?