Tell us what you are trying to do?
Is it possible to use a Mega Menu Plugin together with Toolset Starter and "Layout Plugin"
For example
WP Mega Menu
https://wordpress.org/plugins/wp-megamenu/
Is there any documentation that you are following?
Is there a similar example that we can see?
What is the link to your site?
bauen.lu
many thanks
Georges
The Toolset Starter Theme is deprecated and I suggest to switch to either a Custom Post Type ready theme as shown in the below link, or any theme that uses the_content() to render the post body.
https://toolset.com/documentation/recommended-themes/
Or, if you require a Theme that lets you edit the entire template (inclusive header and footer) with Toolset Layouts, I suggest you create your own custom theme using this simple and very well documented boilerplate:
hidden link
That is an example theme with which you are able to build your own theme structures afterwards.
As for using a Mega Menu Plugin item in a Layout, I am not sure about this.
It depends how Mega Menu provides a method to display its menus
Toolset Layouts lets you add several cells, as well as menus, widgets and others.
Eventually, you can display it with a menu cell.
Eventually, this requires a custom cell, if Mega Menu does not hook in the native menus.
https://toolset.com/documentation/user-guides/creating-custom-cells-unique-functionality/
Or, if Mega Menu hooks in the native WordPress Menu, you can just display that, either thru the Layout cell or by the theme.
It seems to me all that Mega Menu Plugin does is add "themes" to the native WordPress menus, which can easily be displayed with a menu cell in Toolset Layouts:
https://toolset.com/documentation/user-guides/menu-cell/