This does indeed fix the problem. The toolbar button now shows a dropdown arrow and the menu is populated. Thank you very much.

I have added this issue to the tracker:
Issue 2127 – Bookmark drop download menu in Explorer interface

I'm sending you an email with a development version of WinSCP to the address you have used to register on this forum.

Indeed, the dropdown seems to be missing in the "Explorer" interface. I'll look into it.

Here's a screenshot. Maybe I'm blind and there's another button to be had on the toolbar... but that's the toolbar button I'd expect to have a dropdown arrow, and I don't see that there. That, or bookmarks added to the dropdown list that shows below the location bar, which is probably more convenient.

Version is 5.21.3 (no updates offered by update dialog)

Make sure you have the latest version of WinSCP.
If you still do not see the drop down menu, please post a screenshot.

I rarely use the Bookmarks feature. I meant to use it today and discovered that it's less accessible than it could be.

Documentation promises a drop-down menu on that menu button: https://winscp.net/eng/docs/task_navigate#bookmarks

You can also use a drop down menu of the Open directory/bookmark button on the toolbar to open a bookmark.

There is no drop-down menu on the menu button.

To navigate to a bookmark, I have to

1. click on the Bookmarks button (or Ctrl+O)
   
2. locate and double-click on the bookmark I want, which is a narrow row of text, not a menu item.
   

I'd rather have that promised drop-down menu.