301 redirect to root domain to subfolder multisite

I have created a subfolder multisite. i want to redirect all request to subfolder multisite.
say my root domain is :www.xyz.com
subfolder site : https://www.xyz.com/abc/

For a request like https://www.xyz.com/hello-world should be redirect to https://www.xyz.com/abc/hello-world.

How can i achieve it using htaccess.