Windows 10 Start Search has changed. Press the Start button, and when you type, the results appear categorized into Apps, Documents, Email, Web, Folders, Music, People, Photos, Settings, Videos, and more. It is the primary reason why Enhanced mode came into the picture. Unless everything is indexed, this would not have been useful.

Enhanced Search indexes everything. It is its default nature, precisely the opposite of the Classic search. Users can exclude folders where the Search will not look, and index anything which could be personal to the user.

It also means that it can impact life on the battery for laptops. The initial crawl of your data will only take place when connected to power.  During that period, both the CPU usage and battery will take a bit of a hit.

Now that the concept is clear; here is how you can enable Enhanced Mode in Windows 10 Search

1. Go to Settings > Search > Searching Windows
2. Choose the radio button for Enhanced.
3. Next, choose folders which Windows Indexer should exclude from the Enhanced Seach mode.

The next time you search, Windows is looking at all the places, and since they are in the index, the results will be faster.

These, there are two more settings which you should look at.

Advanced Search indexing options allow you to fine tune how or where Windows will search or which files types Windows will search. It will open the same setting available under Classic search.