How to reset the project root

[ghost]

I want to change or reset the project root, since the location of compile_commands.json is moved.

I've tried looking at M-x customize-group ccls or removed .ccls-cache from the project root directory, however I couldn't find a way to reset the project root of the file.

How can I set a new project root?

[ghost]

I managed to reset the project root by deleting .emacs.d/lsp-session-v1. However, this seems to be an overkill. Does ccls provide any efficient way for doing this?

[MaskRay]

It is ~/.emacs.d/.lsp-session-v1, not lsp-session-v1. There seems no support to delete a session. You may send a feature request to lsp-mode.