Tell us what you are trying to do?
I install 3rd party comment plugin ThriveThemes Comments
Is there any documentation that you are following?
Yes, basic documentation from ThriveThemes
So, actually I don't see ThriveThemes comment system integrated and I just wondering how you process your comment cell. Does it use WordPress builtin comment system or Comment Cell is special internal feature by Toolset.
Anyway - is it possible to use 3rd party comment plugins with Toolset and how to do it?
Toolset Layouts basically re-uses the native WordPress comments template.
To create your own cell, you could use the Toolset Layouts API and create a Cell that uses the Thrive Comments template: https://toolset.com/documentation/programmer-reference/layouts-cells-api/
This is subject to custom code, though.
What you can also do, is insert the Thrive Comments with methods provided by that Plugin. They probably have some ShortCodes or functions that return the Comments template.
That could be used anywhere in a Content Template or similar, if it is a ShortCode.
Or, eventually you could craft your own ShortCode returning the template, if there is nothing provided by the Thrive Plugin.