If you need a quick way to use the Find Panel with a preset list of folders (instead of the current folder) without having to re-add them each time, create a button or hotkey which runs a command like this:
Find IN "C:\abc" "D:\xyz"
You can add as many paths as needed.
If you click that when the Find Panel is not open, it'll open it and set those paths. If it's already open, it will still work to change the paths.