I wanted to manage my extensions so when I go to Tools / Extensions, the Extensions menu has an arrow to the right displayed however my 3 installed extensions don't appear in the list. It's empty. My work around is to fo to Popular Extensions in the Orion menu and that window that opens up has a button, "Manage Extensions".
Shouldn't the Extensions menu, under Tools, list what extension you have installed?
Version 1.1.1 (149), WebKit 619.1.11.111.2
Catalina (10.15)