Thanks for the tip, A69. I believe I can wrap up this mystery for OFG now.
Aside from the variability of that menu bar by team, as I mentioned previously and for reasons stated therein, apparently there is a difference in browsers.
Here is the Dodgers team page in Firefox:
And here it is in Microsoft Edge:
Note the elusive Roster and three-dot menu are missing in Firefox but appear in Edge.
And, as you mentioned, the three-dot menu will contain other selections, including Roster if it does not appear by itself:
So, OFG, it's another case of Firefox, our beloved browser, letting us down.
Hmm. Let me amend that. It's another case of website designers working only with Microsoft Edge or Google Chrome in mind.
I have seen this phenomenon many times. It's why I keep Edge available when I become aware of issues like this.
Unfortunately, we Firefox users are not always aware that it's happening. When in doubt, check the website in Edge or Chrome.