Within view templates, the variable `tv-freelinks` is automatically set to the content of $:/config/Freelinks/Enable, which can be set via the settings panel of this plugin.
To change within which tiddlers freelinking occurs requires customising the shadow tiddler [[$:/plugins/tiddlywiki/freelinks/macros/view]]. This tiddler is tagged $:/tags/Macro/View which means that it will be included as a local macro in each view template. By default, its content is:
That means that for each tiddler the variable tv-freelinks will be set to the tiddler $:/config/Freelinks/Enable, which is set to "yes" or "no" by the settings in control panel.
Instead, we can use a filter expression to, say, only freelink within the tiddler with the title "HelloThere":