Try an advanced search.Bump!
Thanks for trying but that still doesn't display all the thread STARTED by a particular user, only all the posts.Try an advanced search.
Click on the search box on the top right of the page, then click Advanced which will bring you up to the search page
Select Search Threads, then enter your forum name or another poster , then select the forum /subforum you want to search
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There is a tech forum and there is a sticky thread that has started by Mark Service who has the title of Tech support.The sticky is from 2017 so he may not be around. If you click on his name "start a conversation" comes up so maybe try that if you haven't done so already.That's a glaring omission, if it can't be done.
There is no tech guy.