Hey Adriano,
I would like to clarify one thing is, this is out of our control if the issue is coming from the template itself instead of Payplans, I can 100% guarantee that, if you downgrade your current site (
https://lojinhadakarly.com.br/2019) Payplans to 3.x version, you will be hit the same issue if you using the same template and same layout configuration.
They do not support third-party extensions
To be honestly, I do not understand what you mean by "they do not support third-party extensions"? Is it what they mean that this template only support for specific 3rd party component only?
So far this is what I tested on your site :
1. If I created a Joomla single article menu item and assign to this template style
"tz_exception - Home 1", it will hit the same issue, you can check my following screenshot.
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http://take.ms/Fqimu
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http://take.ms/ByQh1
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http://take.ms/i3dxl (This is what I notice you didn't set that "Main Body" and "Component" section under this layout)
So I assume the reason it doesn't show the Joomla article content is because of this.
2. Then I tried to assign to another template style
"tz_exception - Blog" then it did show up the content now, so I take a look how this template layout you setup currently, I noticed this layout you got included this "Main Body" and "Component" section then it only show that content on the page.
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http://take.ms/flOnM
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http://take.ms/roZCe
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http://take.ms/JzuuU
Currently I am not sure whether is it related with "Main Body" and "Component" section or not because when I tried to set Payplans menu template style to this
"tz_exception - Blog" , it still doesn't show the component content as well.
Perhaps you can try consult with your current site template provider regarding this again and see whether they know about this or is there any quick hack for support to show Payplans component content into this template layout?
If your template provider also unable to fix this, then we also no ideas how to help you with this since this template is not developed by us.
Perhaps you can consider to switch to another template like using your previous domain site (
https://lojinhadakarly.com.br/) template which display Payplans component content just fine.