To reproduce in 1.20.3 (Stable):
-Change the Connection string to include "///" such as

mongodb:///localhost:27017/?readPreference=primaryPreferred&ssl=false

-Click the "Connect" button

-See screen try to connect but never give control back to user. Screen is grayed out with the thin, green progress line moving.

The database is very basic - no password, default port, localhost, etc.

When adding the 3rd slash to different connection strings, the connection string line is parsed inconsistently as shown by the error message generated (See images). I expected the 3rd slash to generate the same error message for all variations. Perhaps disable the "Connect" button if the parsing is not valid.