how to remove connection from drop-down menu "Recent"?
i looked all over docs and there is an option to remove connection from the list connections in
TOOLS -> PREFERENCES -> Logon History, and even connection was removed from there it still visible in drop-down menu "Recent" in window connection.
Anyway to remove it?

The history for the logon dialog is controlled through the preference you mentioned.

In the recent connections folder you can right-click on a connection and select "Remove" from the popup menu.