I see, thanks Leo.
After a few tests, I want to note this for future reference if I forgot, and for anyone else having this same question
So, Laragon will auto remove deleted project's virtual host settings from Hosts and httpd-vhosts.conf when you add a new project to www folder.
For example, you currently have project A, B, and C in www folder.
Then you delete project A and B.
The Hosts file and httpd-vhosts.conf will stay the same as before.
But when you add a new project, lets say X, Laragon will remove virtual host settings for A and B from Hosts and httpd-vhosts.conf, then make a new virtual host for X.
So as we can see, Laragon can make virtual host for new project, and auto remove it when its project deleted from www folder.