Rebuilding the Windows 10 Search Index
The fastest way to get to Indexing Options (from superuser.com)
Win key + R (Run) then copy and paste the code below.
Or press Windows key + X, and a menu will open up. Click on Control Panel.
In the Control Panel, click on Indexing Options.
Click on Modify, and only keep the hard drives with Windows/Apps/Programs checked (The default is C:). When you’re done, click OK.
In the Indexing Options window, click on Advanced. If you see a pop-up box (User Account Control), click Yes.
In the Advanced Options window, click on Rebuild, and OK.
And you’re done!
It’ll take some time to re-index everything, but searching for Apps, and other files should be much faster now.