How to hide the Contributions page from My Activities?

Found the answer.

Since there isn't actually a My Activities page, this is easier to do than you might think!  What is linked to as "My Activities" is actually the Requests page (by default), which has links to the Contributions page (contributions_page.hbs) and the Following page (subscriptions_page.hbs).

So, to remove the Contributions tab from "My Activities", simply remove or comment out the link from two pages:

• requests_page.hbs
• subscriptions_page.hbs

The resulting code looks like this:

ul class="collapsible-nav-list">
<li class="current">
<a href="{{page_path 'requests'}}" aria-current="page">{{ t 'requests' }}</a>
</li>
{{!-- <li>{{link 'contributions'}}</li>--}}
<li>{{link 'subscriptions'}}</li>

Thanks for coming back and sharing your answer, John!