Glad to hear you’re making progress. Your issue may be related to this:
Seems like your original timeout setting was a custom value, which may not be retained after a browser restart.
I agree that the different client apps can be confusing, but usually, most users rely on only the browser extension and/or mobile app for most routine use. The Web Vault app is primarily used for changing account settings (e.g., master password, KDF, etc.) or specialized tasks (importing, bulk move/delete, etc.). The Desktop app provides more screen real-estate than the browser extension, so it can be useful for editing vault items or other housekeeping tasks (or for viewing items that contain a large volume of information). The CLI is used for advanced tasks that require scripting.