Semantic search is an AI-enhanced search technology that provides more robust results than traditional search. Semantic search supports conversational queries or prompts, such as How do I add shadows to 3D features? or How do I add tools to the Quick Access Toolbar? and returns results that best meet the perceived intent of the search.
Semantic search is not an interactive artificial intelligence application. It does not provide instructions or explanations that can be used to complete workflows.
Semantic search is available for many user interface components that support traditional search if you enable the Semantic Search AI model when you install ArcGIS Pro. These include Command Search, geoprocessing tool search, and property search. If you do not enable semantic search when you install the software, you can enable it later by modifying the setup.
If the Semantic Search model is installed, semantic search is enabled throughout ArcGIS Pro. You cannot enable it for some parts of the application and not others.
An icon 
appears in search boxes that support semantic search. If the model is installed, the icon is enabled. If the model is not installed, the icon is dimmed. If the icon does not appear in a search box, semantic search is not supported. You can confirm whether semantic search is enabled by hovering over the icon and reading the ScreenTip.
Semantic search supports search phrases in the language of the installed and activated ArcGIS Pro language pack. When using a language pack, you can enter both non-English and English search phrases. The quality of results may not be the same in all languages.
Note:
Semantic search requires a processor supporting the AVX2 instruction set. If this hardware requirement is not met, semantic search is disabled even if the semantic search model is installed.