pgAdmin 4 version 3 fails to open a second time

I just installed pgAdmin 4 version 3.0.0 for macOS Sierra, replacing the pgAdmin that came bundled with Postgres 10.3 running locally on the same Mac.

I opened the pgAdmin 4.app app icon, which caused Safari browser to come to the front with a tab showing the usual pgAdmin user-interface. Good.

I closed that tab in Safari. Now when I open the pgAdmin 4.app icon (either double-clicking or choosing File > Open), nothing happens.

Is pgAdmin supposed to launch in a browser window rather than in the app's own window?

➡ How to re-open pgAdmin again?

“Elephant” icon menu

When pgAdmin is running, an elephant icon menu appears. Look at the upper right corner of the screen. The elephant refers to Slonik, the Postgres mascot.

Choose New pgAdmin Window menu item.

FYI, pgAdmin 4 is built as a web app, not a desktop app, even when run locally on your own computer. Note that the internal web server provided by pgAdmin 4 is running continuously, even after you close all windows. Use the Shutdown server menu item, as seen above, if you want to stop that web server.

p.s. I agree, it is very confusing that clicking the icon does not do the same thing (when pgAdmin is already running).

StackExchange Database Administrators Q#203981, answer score: 48