There are two ways to highlight Terms for Confluence cloud :
1. Using the browser extension to automatically highlight terms for all Confluence pages
Please install the appropriate browser extension. Note that the browser extension allows highlight display in Confluence Pages :
Looking for Entreprise Deployment of the extension ?
Scale-up Smart Terms extension deployment in few steps :
Disable "Activate terms highlight" button
Please note that you can disable the terms highlight through the browser extensions and only rely on the "Terms highlighter macro" :
Confluence Admin > Smart Terms configuration > Advanced > Disable highlight through browser extension :