Search in the directory vim was started from

My issue is both for searching within files and across files - how can I always search from the directory I started vim from as root dir?
Currently, I open up vim and able to search in the root directory but then once I open up a file that is in another sub-directory (the subdir is a git repo, the root just holds many such git repos) and then try to search (both with `:Files` and with `Rg`) then I can only search inside the git repo folder of that file, not in the root dir.

How can I change that? I have no special settings for `:Files`... (I did make another command to search specifically inside the closest git repo folder but that is unrelated to the `:Files` command...)