Vodou has no single "reset" button, because its settings are spread across a few separate, purpose-specific files under ~/.vodou/ rather than one profile blob. Resetting the wrong one can be more disruptive than helpful, so reset only what's actually causing your problem:

What you want to resetWhat to do instead of deleting files
Start page / search engineStart page, startup page & search engine — set your desired value there.
Theme / appearanceThemes and appearance — pick a different theme or mode.
Password vaultOpen the vault → Start over (requires typing RESET) — this permanently deletes all saved logins. Only use this if you're sure.
BookmarksRemove bookmarks individually from the bookmark manager.
Browsing dataCtrl+Shift+Del — the built-in, safe way to clear cookies, cache, and session history.

We deliberately don't tell you to delete ~/.vodou wholesale: it holds your password vault and bookmarks, both of which that would destroy permanently and irreversibly. If you genuinely want a completely clean slate and understand that means losing your saved passwords and bookmarks, close Vodou first, then remove the folder — but try one of the specific options above first.