Yii2, how to remove the word site in CNC links?

Question

Yii

Kindest!
After turning on the CNC addresses, for some reason instead /web/index.php?r=site%2Faboutof becoming addresses of type /site/about
1. How to remove the word "site"?
2. How to include css and bootstrap plugins that are in standard places?

Answer 1

After enabling CNC addresses, for some reason, instead of /web/index.php?r=site%2Fabout, addresses like /site/about became

For this, they turn on the CNC, so that they become so
configure url manager like so:
and what are they doing here? With them, everything should be the same as without CNC