On which pages to activate your GDPR Cookie consent plugin?

Hello.
On my website I use a plugin manager (in this specific case Freesoul Deactivate Plugins) which allows me to select which plugins to load and which not to load on each page of my website.
In my case, the website is closed to the public, and members must necessarily go through a page, the access page, to access it.
In order for your plugin to work, do I have to activate the plugin on the whole site or can I activate it only on the page mentioned above?

Thank you