ONLYOFFICE missing Plugins menu/button

I am running a fresh install of Nextcloud server 19. I installed the ONLYOFFICE app as well as the Community Document Server. I want to create custom macros in JavaScript inside ONLYOFFICE spreadsheets. The ONLYOFFICE docs say there should be a plugin button with an icon that looks like a puzzle piece. I cannot find any plugin button.

My installation looks like this Nextcloud example (look at the image under “3. Get to work!” There is no Plugins menu). In contrast the Nextcloud app stock photo shows that there is a Plugins menu.

I would appreciate some guidance in how to get the Plugins menu or button to appear on my Nextcloud. Thanks in advance.