Cannot close Mqtt connections window.

[ghuser]

I am opening mqtt explorer on ubuntu 18.04 (installed via snap)
I see the connections window. Click on the add.

• I add the details
• Click connect
• The progam connects

Now there is no way to close the connections window.
I click on Save / Abort. The window stays open.
I open dev tools and I see no errors when I click any of the buttons.

I restarted the app. I see the newly saved connection, but again there is no way to close the connections window.

[ghuser]

I think the issue was with a firewall, not responding to connections on port 8883.
Does the app support proxy?