On the Settings > Siri & Spotlight panel, click on the Spotlight Privacy… (Priwatność Privacy…) button. Drag and drop your Macintosh HD folder icon on to that Privacy panel, wait 10 seconds, and then click the [-] button to remove it from that panel. Click Done. Spotlight will begin to index your startup drive, your Mac may begin to slow down, and this indexing process may take a few minutes.
You can click the Spotlight 🔍 menu extras button and can observe indexing in progress.
Once your drive is indexed, you should be able to perform Spotlight syntax requests from that menu extras button, or from a Finder Window search field. You can narrow your search results by proper use of Spotlight keywords.